57
मจ LHC-ATLAS ʹݧΔ τοϓΫΥʔΫͱλϨϓτϯʹյΔ ϨϓτΫΥʔΫ୳ࡧͷײධՁ Ҵେ ઌਐཧڀݚՊ ཧٴԠ༻ཧઐد߈ڀݚ Լ זՂେ 2019 2 10
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मจ
LHC-ATLASݧʹΔτοϓΫΥʔΫͱλϨϓτϯʹյΔ
ϨϓτΫΥʔΫ୳ࡧͷײධՁ
Ҵେ ઌਐཧڀݚՊཧٴԠ༻ཧઐ߈ ڀݚد
Լז Ղେ
2019 2 10
ɹ
ཁ
Ԥभߏػڀݚࢠݪ CERNͰɺքେͷߴΤωϧΪʔՃث Large Hadron Collider(LHC)
Λ༻ΤωϧΪʔϑϩϯςΟΞߦݧΘΕΔɻRun1 ͰɺATLAS Αͼ CMS
શΕɻ2015Βࢠɺඪ४ཧͰ༧ΕݟΛࢠͰώοάεݧ
Run2Ͱɺώοάεࢠͷਫ਼ଌఆࢠ୳ࡧΛతͱॏܥΤωϧΪʔ 13TeVͰେ
ͷσʔλΛऔಘΔɻɺRun2લͰಘΒΕσʔλΛ༻ͷཧՌܭ
ใࠂΕΔະʹཧͷஹݟΒΕͳɻޙࠓݱଘͷղੳͰΧόʔΕͳ
ҬॏཁʹͳΔɻ
ҰͰɺ Bதࢠͷਫ਼ଌఆΛߦΔ LHCbɺbelleɺBaBarͷ Ͱཧͷஹݧ3
ͱࢥΘΕΔݱใࠂΕΛΊΔɻΕɺBதࢠηϛϨϓτχοΫʹյΔա
ఔͰඪ४ཧͷ༧ΒζϨΔΞϊϚϦʔͰΔɻͷ BΞϊϚϦʔϨϓτϯͷͷൺ
ͰଌఆΕݧՌେ΄ͲζϨେͳΔͱΛΔɻͷΊཧͷ
ϨϓτϯϑϨʔόʔϢχόʔαϦςΟʔΛΓʹΑҟͳΔࢠͰΔɻ
ͰͱͳΔͷୈ 3ͱڧΔϨϓτΫΥʔΫͰΔɻɺͷϨϓτΫΥʔΫͷ
TeVҬͰΔͱظΕΔɻ
ຊڀݚͰɺͷ BΞϊϚϦʔΒΕΔϨϓτΫΥʔΫΛ LHCʹΔ୳ࡧͰͲͷ
ҬͰ୳ࡧՄΛΔɻLHCͰੜΕΔϨϓτΫΥʔΫରੜաఔࢧతͰ
ୈ 3ͷϨϓτϯͱΫΥʔΫʹյΔɻಛʹ ATLASݧͷݱଘͷղੳͰΧόʔΕͳ
LQLQ rarr tτ tτ աఔʹɻtͱ τ ඇৗʹॏΊʹଟͷյϞʔυΛɻऴঢ়ଶͷ
ϨϓτϯͱλͷΑͼΕΒͷՙͷΛ༻ΧςΰϦʔΛߦɺ৴ײΛେ
ԽΔΊʹΧςΰϦʔͰબͷదԽΛߦɻɺλͷϑΣΠΫʹରΔෆఆΛ
σʔλͰධՁΑͼܥޡͷΛɻͷՌɺBR(LQ rarr tτ) = 1(BR(LQ rarr tτ) = 05)
ʹରɺ13TeV(105TeV)ͷεΧϥʔϨϓτΫΥʔΫΛ 95CLͰغΔͱظΕΔ
ՌಘΒΕɻͷՌɺॳΊ TeVҬͷϨϓτΫΥʔΫʹײΛͱΛɺLHC
ͰϨϓτΫΥʔΫͷஹݟΒΕΔͱେʹظΕΔɻ
3
ୈ 1ষ ং 9
11 BΞϊϚϦʔ 9
12 ϨϓτΫΥʔΫ 11
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ 13
ୈ 2ষ LHCͱ ATLASݕग़ث 16
21 LHC 16
22 ATLAS ثग़ݕ 17
23 ATLASτϦΨʔγεςϜ 21
24 ATLASݧ Run2 23
ୈ 3ষ ಉఆࢠ 24
31 ΦϒδΣΫτͷߏͱఆ 24
32 ϋυϩϯʹյΔ τhad ͷߏ 26
ୈ 4ষ બ 28
41 ৴ͷಛ 28
42 ΧςΰϦʔ 30
43 ৴Ҭ 33
ୈ 5ষ എܠͷධՁ 36
51 Fake Rate method 37
52 എܠͷݟΓͷݕ 39
ୈ 6ষ ༧৴ײΑͼݶ 41
61 CLS 41
62 ϨϓτΫΥʔΫʹରΔݶ 42
63 BΞϊϚϦʔʹରΔߟ 44
ୈ 7ষ ͱΊͱల 46
4
71 ͱΊ 46
72 ͷలޙࠓ 46
ݙจߟ 52
5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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egra
ted
Lum
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
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33Pe
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[10
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5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
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hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ɹ
ཁ
Ԥभߏػڀݚࢠݪ CERNͰɺքେͷߴΤωϧΪʔՃث Large Hadron Collider(LHC)
Λ༻ΤωϧΪʔϑϩϯςΟΞߦݧΘΕΔɻRun1 ͰɺATLAS Αͼ CMS
શΕɻ2015Βࢠɺඪ४ཧͰ༧ΕݟΛࢠͰώοάεݧ
Run2Ͱɺώοάεࢠͷਫ਼ଌఆࢠ୳ࡧΛతͱॏܥΤωϧΪʔ 13TeVͰେ
ͷσʔλΛऔಘΔɻɺRun2લͰಘΒΕσʔλΛ༻ͷཧՌܭ
ใࠂΕΔະʹཧͷஹݟΒΕͳɻޙࠓݱଘͷղੳͰΧόʔΕͳ
ҬॏཁʹͳΔɻ
ҰͰɺ Bதࢠͷਫ਼ଌఆΛߦΔ LHCbɺbelleɺBaBarͷ Ͱཧͷஹݧ3
ͱࢥΘΕΔݱใࠂΕΛΊΔɻΕɺBதࢠηϛϨϓτχοΫʹյΔա
ఔͰඪ४ཧͷ༧ΒζϨΔΞϊϚϦʔͰΔɻͷ BΞϊϚϦʔϨϓτϯͷͷൺ
ͰଌఆΕݧՌେ΄ͲζϨେͳΔͱΛΔɻͷΊཧͷ
ϨϓτϯϑϨʔόʔϢχόʔαϦςΟʔΛΓʹΑҟͳΔࢠͰΔɻ
ͰͱͳΔͷୈ 3ͱڧΔϨϓτΫΥʔΫͰΔɻɺͷϨϓτΫΥʔΫͷ
TeVҬͰΔͱظΕΔɻ
ຊڀݚͰɺͷ BΞϊϚϦʔΒΕΔϨϓτΫΥʔΫΛ LHCʹΔ୳ࡧͰͲͷ
ҬͰ୳ࡧՄΛΔɻLHCͰੜΕΔϨϓτΫΥʔΫରੜաఔࢧతͰ
ୈ 3ͷϨϓτϯͱΫΥʔΫʹյΔɻಛʹ ATLASݧͷݱଘͷղੳͰΧόʔΕͳ
LQLQ rarr tτ tτ աఔʹɻtͱ τ ඇৗʹॏΊʹଟͷյϞʔυΛɻऴঢ়ଶͷ
ϨϓτϯͱλͷΑͼΕΒͷՙͷΛ༻ΧςΰϦʔΛߦɺ৴ײΛେ
ԽΔΊʹΧςΰϦʔͰબͷదԽΛߦɻɺλͷϑΣΠΫʹରΔෆఆΛ
σʔλͰධՁΑͼܥޡͷΛɻͷՌɺBR(LQ rarr tτ) = 1(BR(LQ rarr tτ) = 05)
ʹରɺ13TeV(105TeV)ͷεΧϥʔϨϓτΫΥʔΫΛ 95CLͰغΔͱظΕΔ
ՌಘΒΕɻͷՌɺॳΊ TeVҬͷϨϓτΫΥʔΫʹײΛͱΛɺLHC
ͰϨϓτΫΥʔΫͷஹݟΒΕΔͱେʹظΕΔɻ
3
ୈ 1ষ ং 9
11 BΞϊϚϦʔ 9
12 ϨϓτΫΥʔΫ 11
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ 13
ୈ 2ষ LHCͱ ATLASݕग़ث 16
21 LHC 16
22 ATLAS ثग़ݕ 17
23 ATLASτϦΨʔγεςϜ 21
24 ATLASݧ Run2 23
ୈ 3ষ ಉఆࢠ 24
31 ΦϒδΣΫτͷߏͱఆ 24
32 ϋυϩϯʹյΔ τhad ͷߏ 26
ୈ 4ষ બ 28
41 ৴ͷಛ 28
42 ΧςΰϦʔ 30
43 ৴Ҭ 33
ୈ 5ষ എܠͷධՁ 36
51 Fake Rate method 37
52 എܠͷݟΓͷݕ 39
ୈ 6ষ ༧৴ײΑͼݶ 41
61 CLS 41
62 ϨϓτΫΥʔΫʹରΔݶ 42
63 BΞϊϚϦʔʹରΔߟ 44
ୈ 7ষ ͱΊͱల 46
4
71 ͱΊ 46
72 ͷలޙࠓ 46
ݙจߟ 52
5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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ted
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
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33Pe
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20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ཁ
Ԥभߏػڀݚࢠݪ CERNͰɺքେͷߴΤωϧΪʔՃث Large Hadron Collider(LHC)
Λ༻ΤωϧΪʔϑϩϯςΟΞߦݧΘΕΔɻRun1 ͰɺATLAS Αͼ CMS
શΕɻ2015Βࢠɺඪ४ཧͰ༧ΕݟΛࢠͰώοάεݧ
Run2Ͱɺώοάεࢠͷਫ਼ଌఆࢠ୳ࡧΛతͱॏܥΤωϧΪʔ 13TeVͰେ
ͷσʔλΛऔಘΔɻɺRun2લͰಘΒΕσʔλΛ༻ͷཧՌܭ
ใࠂΕΔະʹཧͷஹݟΒΕͳɻޙࠓݱଘͷղੳͰΧόʔΕͳ
ҬॏཁʹͳΔɻ
ҰͰɺ Bதࢠͷਫ਼ଌఆΛߦΔ LHCbɺbelleɺBaBarͷ Ͱཧͷஹݧ3
ͱࢥΘΕΔݱใࠂΕΛΊΔɻΕɺBதࢠηϛϨϓτχοΫʹյΔա
ఔͰඪ४ཧͷ༧ΒζϨΔΞϊϚϦʔͰΔɻͷ BΞϊϚϦʔϨϓτϯͷͷൺ
ͰଌఆΕݧՌେ΄ͲζϨେͳΔͱΛΔɻͷΊཧͷ
ϨϓτϯϑϨʔόʔϢχόʔαϦςΟʔΛΓʹΑҟͳΔࢠͰΔɻ
ͰͱͳΔͷୈ 3ͱڧΔϨϓτΫΥʔΫͰΔɻɺͷϨϓτΫΥʔΫͷ
TeVҬͰΔͱظΕΔɻ
ຊڀݚͰɺͷ BΞϊϚϦʔΒΕΔϨϓτΫΥʔΫΛ LHCʹΔ୳ࡧͰͲͷ
ҬͰ୳ࡧՄΛΔɻLHCͰੜΕΔϨϓτΫΥʔΫରੜաఔࢧతͰ
ୈ 3ͷϨϓτϯͱΫΥʔΫʹյΔɻಛʹ ATLASݧͷݱଘͷղੳͰΧόʔΕͳ
LQLQ rarr tτ tτ աఔʹɻtͱ τ ඇৗʹॏΊʹଟͷյϞʔυΛɻऴঢ়ଶͷ
ϨϓτϯͱλͷΑͼΕΒͷՙͷΛ༻ΧςΰϦʔΛߦɺ৴ײΛେ
ԽΔΊʹΧςΰϦʔͰબͷదԽΛߦɻɺλͷϑΣΠΫʹରΔෆఆΛ
σʔλͰධՁΑͼܥޡͷΛɻͷՌɺBR(LQ rarr tτ) = 1(BR(LQ rarr tτ) = 05)
ʹରɺ13TeV(105TeV)ͷεΧϥʔϨϓτΫΥʔΫΛ 95CLͰغΔͱظΕΔ
ՌಘΒΕɻͷՌɺॳΊ TeVҬͷϨϓτΫΥʔΫʹײΛͱΛɺLHC
ͰϨϓτΫΥʔΫͷஹݟΒΕΔͱେʹظΕΔɻ
3
ୈ 1ষ ং 9
11 BΞϊϚϦʔ 9
12 ϨϓτΫΥʔΫ 11
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ 13
ୈ 2ষ LHCͱ ATLASݕग़ث 16
21 LHC 16
22 ATLAS ثग़ݕ 17
23 ATLASτϦΨʔγεςϜ 21
24 ATLASݧ Run2 23
ୈ 3ষ ಉఆࢠ 24
31 ΦϒδΣΫτͷߏͱఆ 24
32 ϋυϩϯʹյΔ τhad ͷߏ 26
ୈ 4ষ બ 28
41 ৴ͷಛ 28
42 ΧςΰϦʔ 30
43 ৴Ҭ 33
ୈ 5ষ എܠͷධՁ 36
51 Fake Rate method 37
52 എܠͷݟΓͷݕ 39
ୈ 6ষ ༧৴ײΑͼݶ 41
61 CLS 41
62 ϨϓτΫΥʔΫʹରΔݶ 42
63 BΞϊϚϦʔʹରΔߟ 44
ୈ 7ষ ͱΊͱల 46
4
71 ͱΊ 46
72 ͷలޙࠓ 46
ݙจߟ 52
5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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3
ୈ 1ষ ং 9
11 BΞϊϚϦʔ 9
12 ϨϓτΫΥʔΫ 11
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ 13
ୈ 2ষ LHCͱ ATLASݕग़ث 16
21 LHC 16
22 ATLAS ثग़ݕ 17
23 ATLASτϦΨʔγεςϜ 21
24 ATLASݧ Run2 23
ୈ 3ষ ಉఆࢠ 24
31 ΦϒδΣΫτͷߏͱఆ 24
32 ϋυϩϯʹյΔ τhad ͷߏ 26
ୈ 4ষ બ 28
41 ৴ͷಛ 28
42 ΧςΰϦʔ 30
43 ৴Ҭ 33
ୈ 5ষ എܠͷධՁ 36
51 Fake Rate method 37
52 എܠͷݟΓͷݕ 39
ୈ 6ষ ༧৴ײΑͼݶ 41
61 CLS 41
62 ϨϓτΫΥʔΫʹରΔݶ 42
63 BΞϊϚϦʔʹରΔߟ 44
ୈ 7ষ ͱΊͱల 46
4
71 ͱΊ 46
72 ͷలޙࠓ 46
ݙจߟ 52
5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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4
71 ͱΊ 46
72 ͷలޙࠓ 46
ݙจߟ 52
5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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ted
Lum
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
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33Pe
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[10
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5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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5
ਤ
11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc ) 10
12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1] 10
13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5] 11
14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ 13
15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ 13
16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ 14
17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16] 15
21 LHCશମ [17] 16
22 ATLASݕग़ث [19] 17
23 ෦ඈݕग़ث [19] 19
24 IBLpixelݕग़ث [20] 19
25 ΧϩϦϝʔλ [19] 20
26 ΧϩϦϝʔλ [19] 21
27 ϛϡʔΦϯݕग़ث [19] 22
28 ATLASτϦΨʔγεςϜ [21] 22
29 Run2ͷϧϛϊγςΟ 23
210 2018 RunͷॠϧϛϊγςΟ 23
31 ϙΠϯτʹΔ τhad ͷ ID 26
32 LooseʹΔ τhad IDͷ rejection 27
33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29] 27
41 ttͷյϞʔυͱذൺ 28
42 τ ͷյϞʔυͱذൺ 28
43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV) 31
ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
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120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
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Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ਤ 6
44 PreselectionʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeVαϯϓϧ
BR(LQ rarr tτ) = 02ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) =
1ͱԾఆΔɻ) 33
45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ 34
46 1l1τ OS νϟϯωϧʹΔMeff 35
47 1l1τ SS νϟϯωϧʹΔMeff 35
48 1l2τ OS νϟϯωϧʹΔMeff 35
49 2l1τ OS νϟϯωϧʹΔMeff 35
51 શδΣοτͷ pTͷܭͷ(GeV) 36
52 MET (GeV) 36
53 τhad ͷ pT 1(GeV) 36
54 τhad ͷ pT 2(GeV) 37
55 leptonͷ pT (GeV) 37
56 δΣοτ 37
57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) ID લ ӈਤ1-prong
IDޙ Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ) 38
58 1-prongʹΔ FR 38
59 3-prongʹΔ FR 38
510 1-prong low |η|ʹΔ FR 38
511 3-prong low |η|ʹΔ FR 38
512 1-prong high |η|ʹΔ FR 38
513 3-prong high |η|ʹΔ FR 38
514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR 39
515 FRʹΑΔਖ਼ޙͷશδΣοτͷ pTͷܭͷ(GeV) 39
516 FRʹΑΔਖ਼ޙͷMET (GeV) 39
517 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 1(GeV) 39
518 FRʹΑΔਖ਼ޙͷ τhad ͷ pT 2(GeV) 40
519 FRʹΑΔਖ਼ޙͷ leptonͷ pT (GeV) 40
520 FRʹΑΔਖ਼ޙͷδΣοτ 40
61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ 42
62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ 43
63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹ
ରΔݶ 43
64 β = 05ͷͷ LQͷյذൺ 44
ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ਤ 7
65 εΧϥʔ LQʹରΔغҬͱ β = 05γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
66 εΧϥʔ LQʹରΔغҬͱ β = 10γφϦΦʹΔ BΞϊϚϦʔΒ
ΕΔҬ 45
71 truth 3-prong τ ͷߏͱ 2-prongͱߏΕΔ 48
72 Meff (GeV)ʹରΔγϯάϧϨϓτϯͱ HT τϦΨʔͷऔಘ 48
73 LQ୯Ұੜաఔ 49
74 LQ Drell-Yanੜաఔ 49
75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42] 49
8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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egra
ted
Lum
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
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33Pe
ak L
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[10
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5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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8
ද
11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9] 12
12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15] 14
21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19] 18
41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷ
ΧοτΛཁٻͳ ivar isolationͷཁ[30](ٻ 29
42 εΧϥʔ LQͷඍஅ໘ [30] 30
43 શΧςΰϦʔͷ Preselection 32
44 ৴ҬʹΔબ 1 33
45 ৴ҬʹΔબ 2 34
9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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9
ୈ 1ষ
ং
ૉࢠཧ ԽΕɻܥʹలɺඪ४ཧͱମٸͱཧͰݧɺޙل20
ͷඪ४ཧऑεέʔϧͰɺ΄ͱΜͲશͷݧΛઆͰΔɻ2012ͷώοάε
ࢠΑɺඪ४ཧͰ༧ΕΔૉʹݟࢠ 17छશݟΕɻΕΒͷૉࢠ
ΛߏΔϑΣϧϛΦϯͱࢠͷ૬ޓ༻Λ୲ϘιϯΒͳΔɻϑΣϧϛΦϯɺΫΥʔΫͱ
ϨϓτϯΒͳΓɺΕΕ 3ଘࡏΔɻʹΑΕΕͷૉࢠͷҟͳΓɺ
ͰଌఆΔඞཁΔύϥϝʔλͰΔɻϘιϯɺ3ݧ ͷ (૬ޓ༻ɾऑ૬ޓ༻ɾ
ɺZɾWࢠରԠɺʹ(༺ޓ૬ڧ ϘιϯɺάϧʔΦϯʹՃɺͷݯىͰΔώοά
εࢠͷ 5ͷࢠΒͳΔɻɺඪ४ཧͰήʔδ SU(3)timesSU(2)timesU(1)ͷରশཁ
ड़ΕΔɻͷͱΛϨϓτϯวهΕʹΘΒಉήʔδͰٻ (LFU Lepton
Flavor Universality)ͱݺͿɻ
ͷষͰɺΕΔϨϓτϯวͷΕΛݧՌʹΑͼΕΒ
ΒΕΔϨϓτΫΥʔΫͷٴܕͼ LHCͰͷ୳ࡧʹड़Δɻ
11 BΞϊϚϦʔ
ϑϨʔόʔͷཧͷਫ਼ଌఆʹɺཧͷͱͳΔΑͳݧՌใࠂΕΔɻ
Ͱɺಛʹ BதࢠͷηϛϨϓτχοΫյͷਫ਼ଌఆͷ BΞϊϚϦʔʹड़Δɻ
111 b rarr cτν
LHCb Belle BaBarͱ 3ͷݧͰ BதࢠՙΧϨϯτΛհ DதࢠͱϨϓτ
ϯʹյΔաఔΛ༻ϨϓτϯวͷςετͷଌఆΛߦΔɻͷյաఔͷϑΝΠϯ
ϚϯμΠΞάϥϜΛਤ 11ʹɻࡍʹଌఆΔୈ 3ϨϓτϯͰΔ τ ͱ ντ ʹյ
ΔյذൺͱͷଞͷͷյذൺͱͷൺɺR(D) R(Dlowast)ΛଌఆΔɻΔͱͰ
ΛΩϟϯηϧΔͱͰΔɻͰදͱҎԼͷΑʹͳΔɻޡܥ
R(D(lowast)) =Γ(B rarr D(lowast)τν)
Γ(B rarr D(lowast)lν)(11)
ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 1ষ ং 10
ͷݧ3 R(D) R(Dlowast)ଌఆՌΛΈΘͷਤ 12ʹͳΔɻͷΑʹ R(D)-R(Dlowast)Ͱ
ඪ४ཧͷ༧ଌΒ 4σ ζϨΔɻɺb-factoryݧͰଌఆͰͳɺΑΓॏ Bதࢠ Bc
ͷյͰಉͷ LHCbʹΔ R(Jψ)ͷଌఆͰ 2σ ζϨΔͱՌ [2]ใࠂΔɻ
R(D) R(Dlowast) R(Jψ)ͱதࢠͷεϐϯΫΥʔΫͷҧʹΑΒʹΞϊϚϦʔݟ
Γɺb rarr cτν ʹཧࡏΔͱΛΔɻ
ਤ 11 BதࢠͷηϛϨϓτχοΫյͷϑΝΠϯϚϯμΠΞάϥϜ ਤB0ࠨ) ӈਤBplusmnc )
02 03 04 05 06R(D)
02
025
03
035
04
045
05
R(D
) BaBar PRL109101802(2012)Belle PRD92072014(2015)LHCb PRL115111803(2015)Belle PRD94072007(2016)Belle PRL118211801(2017)LHCb PRL120171802(2018)Average
Average of SM predictions
= 10 contours2χΔ
0003plusmnR(D) = 0299 0005plusmnR(D) = 0258
HFLAV
Summer 2018
) = 742χP(
σ4
σ2
HFLAVSummer 2018
ਤ 12 R(D) R(Dlowast)ͷWorld Averageͱ SMͷཧ [1]
112 b rarr smicromicro
ͷաఔ SM ͰπϦʔϨϕϧͷյࢭېΕΔ FCNC(Flavor Changing Neutral
Current)յաఔͰΔɻյذൺ O(10minus67)([3])ͱكյͰΔΊཧʹରͷײ
ߴɻϛϡʔΦϯऴঢ়ଶʹΔൺతΕͳऴঢ়ଶͷͰɺLHCbݧײ
ͷՌΛग़Δɻୈ 1ɾ2ͷ LFUͷςετͱ b rarr cτν ͱಉʹҎԼͷ R(Klowast)ͷଌఆΛΔɻ
ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
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ity
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100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 1ষ ং 11
R(K(lowast)) =Γ(B rarr K(lowast)micromicro)
Γ(B rarr K(lowast)ee)(12)
ਤ 13 ʹ LHCb Δʹݧ R(K) R(Klowast) ͷଌఆՌΛɻͰ R(K) R(Klowast) q2 =
(pmicro+ + pmicrominus)2 ͷͰଌఆΕɺΕΕ SMͷཧΒ 26σ 38σ ಘΒΕΔɻ
ͷݧ b rarr smicromicroͷཚৼ෯ΛԼΔΑͳཧଘࡏΔͱΛΕΔɻࡍʹ
ͷաఔʑͳ Bதࢠͷյͷཚৼ෯ͷଌఆɺBs rarr φmicromicro[6] Λ0b rarr Λmicromicro[7]ߦΘΕԼʹ
1-2σ ఔζϨΔɻɺऴঢ়ଶͷ 2ͷ microͷյʹΔύϥϝʔλͷ 1ͰΔ
P prime5 ɺSMΒ 34σ ζϨΔ [8]ɻ
ਤ 13 LHCbݧʹΔ R(K) R(Klowast)ͷଌఆՌͱ SMͷཧ [4][5]
ͷΑʹɺBΞϊϚϦʔ ʹͼʑͳաఔͰίώʔϨϯτٴʹݧ3 SMΒζϨ
ΔɻͷΒཧͷݤͱɺݧՌͷ৴པߴେมΛΊΔɻ
12 ϨϓτΫΥʔΫ
B ΞϊϚϦʔΛઆͰΔϨϓτΫΥʔΫ (LQ) ͰΔɻLQ େҰཧ
(GUT) ςΫχΧϥʔͳͲΒ༧ΕΔϨϓτϯͱΫΥʔΫʹΔϨϓτϯ Lɺό
ϦΦϯ Bɺ৭ՙ C ΛࢠͰΔɻϨϓτϯͱΫΥʔΫͷΈΘͰՙ
(plusmn13plusmn23plusmn43plusmn53) ଘࡏΔɻεϐϯεΧϥʔϕΫλʔߟΒΕΔɻ
ͰɺBΞϊϚϦʔΔ LQʹड़Δɻ ϨϓτϯΫΥʔΫʹΔϨϓτϯͱΫΥʔ
Ϋͷ λlq ͰͷΑʹॻͱͰΔɻ
λql =
⎛
⎝0 0 00 λ22 λ230 λ32 λ33
⎞
⎠ (13)
ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 1ষ ং 12
ͰɺBதࢠͷਫ਼ଌఆΒୈ 1ͱͷ SMͱΑҰகΔΘ
ΔΊɺୈ 1ࢠབྷΉ λ1lλq1 શ 0ͱΔɻb rarr cτν աఔͰɺλ23λ33 ༩د
Γɺb rarr smicromicroաఔͰɺλ22λ32 ΔΕఆతʹઆͰΔɻߟ༩Δͱد
121 BΞϊϚϦʔͱϨϓτΫΥʔΫ
B ΞϊϚϦʔΒಈػΕΔϨϓτΫΥʔΫΛද 11 ʹͱΊΔɻɺ1 ͷϨϓτ
ΫΥʔΫͰ 2 ͷ B ΞϊϚϦʔΛઆΔͱͰΔͷϕΫλʔͷ U1 ͰΔ [10]ɻɺ
2 ͷεΧϥʔϨϓτΫΥʔΫͷಋೖΑઆͰΔɻΕද 11 ʹΔ S1 S3[10] ͱ
R2 S3[11]ͷΈΘͰΔɻ
ϨϓτΫΥʔΫ (SU(3)SU(2)U(1)) Spin ୈ 3ͷյ
S1 (3 1 13) 0 S1 rarr tτ bν
R2 (3 2 76) 0 R2 rarr tτ bτ
S3 (3 3 13) 0 S3 rarr tτ bτ tν bν
U1 (3 1 23) 1 U1 rarr bτ tν
ද 11 BΞϊϚϦʔͷͱͳΔεΧϥʔɾϕΫλʔϨϓτΫΥʔΫ [9]
122 R(D(lowast))ΒΕΔ LQͷҬ
1ͷͱද 11ͷ S1 ʹΑΔ R(D(lowast))ΞϊϚϦʔͷҬΛΔɻR(D(lowast))ΞϊϚ
ϦʔΛ S1 Ͱهड़Δͱ R(D(lowast))ͷΑʹͳΔ [12]ɻ
R(D(lowast)) = |1 + CV |2 timesRSM (D(lowast)) (14)
CV =1
2radic2GFVcb
λ23λ332M2
S1
=λ23λ33
4radic2GFVcbM2
S1
(15)
ͰɺGF ϑΣϧϛఆɺVcb CKMߦͷ (23)ɺMS1 S1 ͷͰΔɻGFɺ
Vcb ఆͰΔΊ S1 ͷد༩ λ23λ33MS1 ͷ 3 ͷύϥϝʔλͰΔͱͰΔɻ
λ23 ≫ λ33 λ23 ≪ λ33 ΛߟΔͱΕΕ λql-MS1 ͷ ฏ໘Ͱݩ2 BΞϊϚϦʔ
ͷҬΔ (ਤ 14)ɻR(D(lowast)) ΞϊϚϦʔΒΕΔͷͷઢͷҬͰΔɻҰͰɺ
LHCͷ୳ࡧʹΔغΕҬΕΕઢͱ৭ͰඳΕҬͱͳΔɻLHCͷ
୳ࡧͷࡉ 132Ͱड़ΔɻࠨਤΒΘΔΑʹ λ23 ≫ λ33 طʹશҬͰغΕΔɻ
λ23 ≪ λ33 ͷͰಈతΛԾఆΔ (λ2lq4π lt 1)ͱ 1TeVʹ S1 ΔͱΛ
Δɻλ23 sim λ33 ͷʹਤ 15ͷΑʹͳΔɻҎͷΑʹ 1ͷͰΔMS1
TeVͷҬͰ λ23 lt λ33 ͷҬඇৗʹ BΞϊϚϦʔͰΕ LHCͰ୳ࡧͰͳ
ͳҬͱͳΔɻͷΊɺୈ 3ʹյΔॏ LQͷ୳ࡧʹΑஹݟΒΕΔ
ͱظΕΔɻ
ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
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R U U
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L
U
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L
U
R L L
L
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ୈ 1ষ ং 13
ਤ 14 MS1 -λql ฏ໘ʹΔ B ΞϊϚϦʔͱ LHC ʹΑΔغҬ ਤλ33ࠨ) ≪ 1 ӈ
ਤλ23 ≪ 1 (রຊจࡉ
ਤ 15 λ33 = 1ʹΔMS1 -λ23 ฏ໘ͷ BΞϊϚϦʔͱ LHCʹΑΔغҬ
13 LHCʹΔϨϓτΫΥʔΫ୳ࡧ
ΒΕΔݟࡏݱ BΞϊϚϦʔຊʹཧʹΑΔݱͰϨϓτΫΥʔΫདྷͱͱ
ΛఆΔΊʹ LHCͷ୳ࡧͰݟʹࡍΔͱॏཁͰΔɻͰɺLHCʹ
Δ୳ࡧઓͱ ATLAS ՌΛग़ΔߦΑΓઌݧ CMS ΔϨϓτʹݧ
ΫΥʔΫ୳ࡧͷݱঢ়ʹड़Δɻ
131 LHCʹΔϨϓτΫΥʔΫͷੜͱյ
LHCͷཅࢠ-ཅࢠίϥΠμʔʹͷ୳ࡧͰɺࢧతͳੜաఔରੜաఔͰΔɻͷ
ϑΝΠϯϚϯμΠΞάϥϜΛਤ 16ʹɻͷաఔڧ૬ޓ༻ͷ αs ʹΑ LQੜ
ΕΔΊɺੜஅ໘ LQͷ λlq ʹΑΒ LQͷMLQ ͷΈʹґଘΔɻͷΊ
ϞσϧʹΑΒͳ LQ୳ࡧΛΔͱՄͰΔɻ
ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 1ষ ং 14
ਤ 16 ϨϓτΫΥʔΫରੜաఔͷϑΝΠϯϚϯμΠΞάϥϜ
LQͷյ λlq ʹґଘΔɻୈ 3ͷ λ33 ≫ λlq ΛԾఆΔͱ LQͷՙʹ
ΑյϞʔυΔɻLQplusmn23 rarr bτ tν LQplusmn13 rarr tτ bν ΒΕΔɻߟ
ɺLQ ಉΫΥʔΫͱϨϓτϯʹյΔऴঢ়ଶ LQLQ rarr bbττ ttττ bbνν ttνν
աఔͷ୳ࡧʹযΛߜΔɻɺLQLQ rarr bbνν ttνν աఔݱଘͷ SUSY ୳ࡧͷ
sbottom[13]stop[14] ୳ࡧͰશʹΧόʔΕΔɻͷΊɺSUSY ʹରΔݶΛ LQ ʹ
ղऍΕɻɺLQLQ rarr bbττ աఔ di-higgs୳ࡧʹΔ HH rarr bbττ աఔͱ
ऴঢ়ଶΛΊɺطʹ LQ ୳ײʹࡧΛղੳͱͳΔɻɺATLAS Ͱݧ
LQLQ rarr ttττ աఔʹײΛղੳଘࡏͳɻͰɺຊڀݚͰ LQLQ rarr ttττ աఔ
ʹɺղੳઃܭΛߦɻ
132 CMSݧʹΔϨϓτΫΥʔΫ୳ࡧ
LHCݧʹΔ LQ୳ࡧͰɺCMSݧ ATLASݧΑΓ Run2ͰͷՌΛग़
Δɻୈ 3ͱΔ LQ୳ࡧͷՌΛද 12ʹͱΊΔɻ
Decays εΧϥʔ LQ limits ϕΫλʔ LQ lmits
bbττ 1000 (810) GeV 1780 (1530) GeV
ttττ 900 (560) GeV 1440 (1220) GeV
bbνν 1100 (800) GeV 1810 (1540) GeV
ttνν 1020 (820) GeV 1780 (1530) GeV
ද 12 CMSݧʹΔୈ 3 LQ β = 1(β = 05)ʹରΔݶ [15]
ຊڀݚͱಉաఔͰΔ LQLQ rarr ttττ աఔΛݟɻͷղੳͰɺϨϓτϯͱλ
ͷͰ 1l1τ 1l2τ ͱ 2ͷΧςΰϦʔͰղੳΛߦΔɻલͷ৴ײऴ
తʹߏ topͷ pT Ͱ fitΔ (ਤ ਤ)ɻදࠨ17 12ʹΑʹ LQLQ rarr ttττ
β = 1 ʹର 900GeV ͱײѱɻͷݪҼͱ 2 ͷΧςΰϦʔͷΈͰ৴
ΒΕΔɻLQڍΛΧόʔͰͳͱ ୈ 3 ࢠʹյͳ
(λ33 ≫ λlq)ͷεΧϥʔ LQʹରΔݶਤ 17ʹͳΔɻ800GeVҎԼΛغΔΑ
ʹࡍΔݟʹ 122ͰΑʹ λ23 sim λ33 ͷߟΒΕΔͷͰ 800GeVͰ
શʹغͰͳͱΛڧௐɻ
ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
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33Pe
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per
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[10
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5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
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EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
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[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
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[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
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[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
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[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
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[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
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[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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R U U
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U
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L
U
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L
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R L L
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U U
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ୈ 1ষ ং 15
ਤ 17 CMSݧʹΔ LQLQ rarr ttττ աఔΛ༻ LQ୳ࡧՌ [16]
16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
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120
140
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LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
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Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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U
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16
ୈ 2ষ
LHCͱ ATLASݕग़ث
ͷষͰɺLarge Hadron Collider(LHC)ͰͷཅࢠͷՃʹͱ ATLASݕग़ثͲͷΑ
ʹઃܭΕΔΛઆΔ [18][19]ɻ
21 LHC
ਤ 21 LHCશମ [17]
CERNͷ LHCɺεΠεͷδϡωʔϒԼ 100mͷτϯωϧͷதʹݐઃΕɺ ͷେ
ԁप 27kmʹΑͿɻॏܥΤωϧΪʔradics = 14TeVɺॠϧϛϊγςΟ 10times10minus34cmminus2sminus1ɺ
όϯν 2808ͰઃܭΕΔɻ1όϯνΓ 1011 ࢠͷཅݸ 1ඵʹΑ 4000ສճ
ͷিಥىΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 2ষ LHCͱ ATLASݕग़ث 17
ɹͷিಥىΔͰͷཁΛड़ΔɻɺਫૉͷΠΦϯԽʹΑऔΓग़ཅࢠΛઢܗ
Ճث (LINAC2) ͰΤωϧΪʔ 50MeV ʹͳΔͰՃΕΔɻଓɺ3 ͷԁܗγϯΫ
ϩτϩϯՃث Proton Synchrotron Booster(PSB)ɺProton Synchrotron(PS)ɺSuper Proton
Synchrotron(SPS)Ͱॱʹ 14GeVɺ25GeVɺ450GeV ͰՃΕΔɻऴతʹ LHCͷϦϯά
ʹೖΓઃܭΤωϧΪʔʹ౸ୡΔͰՃϏʔϜΛিಥΔɻLHCͷશମΛ
ਤ 21ͰΑʹɺLHCͰཅࢠ-ཅࢠিಥͷΈͳΒॏΠΦϯͷিಥݧߦΘΕΔɻ
22 ATLAS ثग़ݕ
ATLASݕग़ثશ 44mɺܘ 25mɺ૯ॏ 7000tͰઃܭΕେݕࢠܕग़ثͰΔɻ
ͷશମΛਤ 22ʹɻATLASݕग़ثଆΒɺ෦ඈݕग़ثɺΧϩϦϝʔλɺϛϡʔΦ
ϯݕग़ثΒͳΔෳݕܕग़ثͱͳΔɻɺݕग़ثͳΔଟͷΛతʹอ
ΔΊʹɺݕग़ثͷલͱޙʹΔόϨϧҬͱ 2ͷΤϯυΩϟοϓҬ (ΧϩϦϝʔλͷ
ΈϑΥʔϫʔυҬΔ)ʹΕΔɻ
ਤ 22 ATLASݕग़ث [19]
ΕΕͷݕग़ثʹड़Δલʹɺݕग़ثʹΔඪܥΛఆɻx y ΛΕ
ΕԁܗՃثͷதͷͱͷʹͱΓɺӈखܥΛΑϏʔϜϥΠϯͷʹ z
ΛͱΔɻղੳʹ (x y z)ඪܥΑΓɺ(pT ηφ)ܥҰൠతʹΘΕΔɻPT ӡಈ
P Λ xy ฏ໘ʹӨԣӡಈɺη ϥϐσΟςΟɺφҐͰΔɻη ɺఱΛ θ
ͱͰදΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
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Jul 16Jan 17
Jul 17Jan 18
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ATLAS Recorded
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Initial 2018 calibration
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LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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U
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![Page 19: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/19.jpg)
ୈ 2ষ LHCͱ ATLASݕग़ث 18
η = minus ln tan(θ2) (21)
ɺڑͷύϥϝʔλ ∆R η minus φฏ໘ʹͰఆΕΔɻ
∆R =radic
∆η2 +∆φ2 (22)
Δղͱʹثग़ݕ (21)Ͱఆ η ͰදײҬΛද 21ʹͱΊɻ
ثग़ݕ ղ Ҭײ |η|෦ඈݕग़ث σpT pT = 005pT oplus 1 25
ΧϩϦϝʔλ σEE = 10radicE oplus 07 32
ϋυϩϯΧϩϦϝʔλ
όϨϧɺΤϯυΩϟοϓ σEE = 50radicE oplus 3 32
ɹϑΥʔϫʔυ σEE = 100radicE oplus 10 31 lt |η| lt 49
ϛϡʔΦϯݕग़ث σpT pT = 10 at pT = 1TeV 27
ද 21 Ҭײͷղͱثग़ݕ (pT E ͷ୯Ґ GeV )[19]
221 ෦ඈݕग़ث
෦ඈݕग़ثՙࢠͷӡಈͷଌఆͱিಥͷߏओͳͰɺΒ
IBL(Insertable B-layer)pixel ثग़ݕɺγϦίϯετϦοϓثग़ݕ (SCT)ɺભҠݕܕग़ث
(TRT) ΒͳΔɻόϨϧҬͷΛਤ 23 ʹɻɺ෦ඈݕग़ثΛΑʹιϨϊ
ΠυੴઃஔΕΓɺ2T ͷΔɻՙࢠͷڧͳͰϩʔϨϯπ
ʹΑۂΒΕɺͷۂΒӡಈଌఆΕΔɻ
bull IBLpixelݕग़ث
ɹ Run1 ͷ pixel େॠϧϛϊγςΟثग़ݕ 10 times 10minus34cmminus2sminus1 σβΠϯΕ
ΓɺϧϛϊγςΟΒʹߴͳΔͱอΕͳɻͷରࡦͱɺRun2
ͰΑΓࡉϏʔϜύΠϓͱͱʹ IBLૠೖΕɻIBLΛΉϐΫηϧݕग़ثͷஅ
໘ਤΛਤ 24ʹɻIBLܘ 33cmͷʹΓɺ14ͷεςʔϒಉॏͳΓ
ΑʹઃஔΕΔɻIBLͷݕग़Մғ |η| lt 30ͱΊʹऔΔɻ
ɹ IBLpixelݕग़ثγϦίϯಋମݕग़ثͰΔɻIBLόϨϧҬʹ ݕɺpixelݸ280
ग़ثόϨϧҬʹ 1456 ʹɺΤϯυΩϟοϓҬݸ 144 times 2 ͷϞδϡʔϧΛஔݸ
Δɻ
bull SCT
ɹ SCTγϦίϯಋମݕग़ثͰΔɻSCTόϨϧҬ 4ɺΤϯυΩϟοϓҬ 9
ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
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ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 2ষ LHCͱ ATLASݕग़ث 19
ΒͳΓɺܭ ͷϞδϡʔϧΛஔΔɻSCTͷݸ4088 1Ϟδϡʔϧ 2ຕͷγϦί
ϯΒͳΓɺޓ φʹ 40mradΒஔΕΔɻ
bull TRT
ɹ TRT XeͳͲʹΑΔؾମͷΨεݕग़ثͰΔɻ෦ඈݕग़ثͷʹஔ
ΕͷײҬ |η| lt 20ͰΔɻ1τϥοΫΓฏۉ 30ͷώοτΛͱͰਖ਼
ͳඈͷߏΛՄʹΔɻTRTՙࢠҟͳΔΛ௨ΔͱʹΑग़Δ
ભҠΛར༻ΔɻͷભҠͷେՙࢠͷϩʔϨϯπҼࢠʹൺΔɻͷ
ϩʔϨϯπҼࢠʹΑύΠΦϯͱΤϨΫτϩϯͳͲΛผΔͱՄʹͳΔɻ
ਤ 23 ෦ඈݕग़ث [19]
ਤ 24 IBLpixelݕग़ث [20]
ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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ݙจߟ 54
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icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 2ষ LHCͱ ATLASݕग़ث 20
222 ΧϩϦϝʔλ
෦ඈݕग़ثͷଆʹઃஔΕΔΧϩϦϝʔλΧϩϦϝʔλͱϋυϩϯΧϩϦϝʔ
λΒͳΔɻΕΕɺࢠγϟϫʔͱϋυϩϯγϟϫʔʹΑམͱΤωϧΪʔΛଌ
ఆΔɻͷΧϩϦϝʔλͷܥΛਤ 25ʹɻ
ਤ 25 ΧϩϦϝʔλ [19]
bull ΧϩϦϝʔλɹΧϩϦϝʔλόϨϧҬ (|η| lt 1475) ͱ 2 ͷΤϯυΩϟοϓҬ (1375 lt
|η| lt 32)ΒͳΔɻਤ 26ʹ η = 0ʹΔΧϩϦϝʔλͷਤΛɻਤʹ
௨ΓɺΧϩϦϝʔλ 3ΒͳΔɻͷόϨϧҬʹΔେ 1Βɺ
∆η times∆φ = 00258times 01ɺ0025times 0025ɺ0050times 0025ͱͳΔɻਤ 26ͷ trigger
tower LEVEL1τϦΨʔʹॏཁͳͷͰޙड़ΔɻΧϩϦϝʔλԖΛٵऩ
ͱɺӷମΞϧΰϯͰΠΦϯԽՙࢠΛݕग़ΔͱͰΤωϧΪʔΛଌఆΔɻ
bull ϋυϩϯΧϩϦϝʔλɹϋυϩϯΧϩϦϝʔλҬͰߏཁૉҟͳΔɻਤ 25 ͷ Tile barrel(|η| lt 10)ɺ
The extended barrel(08 lt |η| lt 17)ͱදهΔҬͰɺమΛٵऩͱγϯν
ϨʔλͰଌఆΔɻLAr hadronic end-cap(HEC)ͰΧϩϦϝʔλͷӷମΞϧΰ
ϯΛڞಔΛ༻ΔɻޙʹϑΥʔϫʔυҬ (31 lt |η| lt 49) ϏʔϜʹ
ඇৗʹͳΔͷͰɺઢͷΊʹλϯάεςϯಔΘΕӷମΞϧΰϯͰΤωϧ
ΪʔΛଌఆΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
-1fb
Tota
l Int
egra
ted
Lum
inos
ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
Fill
[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 2ষ LHCͱ ATLASݕग़ث 21
ਤ 26 ΧϩϦϝʔλ [19]
223 ϛϡʔΦϯݕग़ث
ϛϡʔΦϯॏΧϩϦϝʔλͰΤωϧΪʔΛ΄ͱΜͲམͱͳΊʹɺΧϩϦ
ϝʔλΛಥൈΔɻͰϛϡʔΦϯΛଌఆΔΊʹɺϛϡʔΦϯݕग़ثΕ
ΔɻͷϛϡʔΦϯݕग़ثͷߏΛਤ 27 ʹɻϛϡʔΦϯݕग़ثେ 4 ͷݕग़
ΒͳΔɻओʹτϥοΫͷଌఆతͷMoniteredث drift tubes(MDT)ɺCathode strip cham-
bers(CSC) ͱτϦΨʔػΛ୲ Resistive plate chambers(RPC)ɺThin gap chamber(TGC)
ஔΕΔɻ
23 ATLASτϦΨʔγεςϜ
ATLASݧ Run2ʹɺΠϕϯτϨʔτ 40MHzΓɺͷσʔλΛܧଓతʹऔ
ಘΔͱσΟεΫͷετϨʔδͱίϯϐϡʔλͷγεςϜͷݶʹΑɻͰɺ
ཧతʹڵຯΔͷΈతʹऔಘΔΊʹɺτϦΨʔΛೋஈ֊ʹஈ֊ͰऔಘΛམ
ͱσʔλΛऔಘΔɻॳͷ Level 1 τϦΨʔʹΧϩϦϝʔλͱϛϡʔΦϯݕग़
ͷใʹΑΓɺ25microsث ͰϋʔυΣΞॲཧΕ 40MHz Β 100kHz ͰݮΒΕΔɻଓɺ
ೋஈ֊ͷ High Level Trigger(HLT)ʹɺશใΛιϑτΣΞॲཧΕऴతʹ
1kHzͰݮΒΕ ATLASͷετϨʔδʹอଘΕΔɻ
ɹΑΓతʹڵຯͷΔΛऔಘΔΊʹ Run2ΑΓ L1 topoͱ Fast tracker(FTK)ಋ
ೖΕΔɻL1 topo LEVEL1τϦΨʔͷஈ֊Ͱ ∆RͳͲͷτϙϩδʔʹΔΧοτΛՄ
ʹΔͱͰഎܠେ෯ʹݮͰΔɻɺFTK HLTॳظஈ֊ͰඈใΛ
ͱΛՄʹΔͱͰΠϕϯτϨʔτΛݮΔͱظΕΔɻ
ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
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0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
-1 fbPhysics 140
Initial 2018 calibration
ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
s-2
cm
33Pe
ak L
umin
osity
per
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[10
0
5
10
15
20
25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
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ୈ 2ষ LHCͱ ATLASݕग़ث 22
ਤ 27 ϛϡʔΦϯݕग़ث [19]
ਤ 28 ATLASτϦΨʔγεςϜ [21]
ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
Jul 18
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egra
ted
Lum
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ity
0
20
40
60
80
100
120
140
160ATLASPreliminary
LHC Delivered
ATLAS Recorded
Good for Physics
= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
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ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
]-1
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umin
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10
15
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25 = 13 TeVs ATLAS Online Luminosity
LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
Initial 2018 calibration
ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
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[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
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hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
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EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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R U U
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ୈ 2ষ LHCͱ ATLASݕग़ث 23
24 ATLASݧ Run2
2018 10 ʹ 4 ͷ Run2 ऴɺσʔλऔಘऴΔɻLHC ΒڅڙΕ
σʔλͷܭ 158fbminus1ɺATLASݧͰऔಘΕσʔλͷܭ 149fbminus1ɺATLASશݕ
ग़ث Runதʹແಈཧղੳʹ༻Δ Run(Good Runs List)ͷσʔλͷܭ
140fbminus1 ͰΔ citekey-215ɻ4ͷΕΕͷϧϛϊγςΟͷԣΛมભʹ
ͷΛਤ 29ʹɻɺRun2ͰେͷσʔλΛऔಘΔΊʹʑϧϛϊγςΟͷڧΛߦ
ɺ2018ʹॠϧϛϊγςΟ 214times 10minus34cmminus2sminus1 Λه [22]ɻ2018 Runͷॠϧϛ
ϊγςΟΛਤ 210ʹɻ
Month in YearJan 15
Jul 15Jan 16
Jul 16Jan 17
Jul 17Jan 18
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20
40
60
80
100
120
140
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= 13 TeVs-1 fbDelivered 158-1 fbRecorded 149
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ਤ 29 Run2ͷϧϛϊγςΟ
Day in 20182903 0105 0306 0507 0708 0909 1210 1411
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LHC Stable Beams-1 s-2 cm33 10timesPeak Lumi 214
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ਤ 210 2018 RunͷॠϧϛϊγςΟ
24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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ݙจߟ 54
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[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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24
ୈ 3ষ
ಉఆࢠ
ͷষͰɺATLAS ΕಉఆΔΛड़ߏͲͷΑʹΦϒδΣΫτʹݧ
ΔɻͷղੳͰಛʹϋυϩϯʹյΔ τhad ಛʹॏཁͱͳΔͷͰɺτhad ͷߏΑͼ
ผ (ID)ʹड़ɻ
31 ΦϒδΣΫτͷߏͱఆ
311 ࢠ e[23]
ΛϚονϯάܗτϥοΫΛΧϩϦʔϝʔλʹΔΤωϧΪʔଛͷΫϥελʔͷࢠ
ΔͱͰߏΕΔɻɺͷࢠ likelihood Λ༻ ID ΛผΕΔɻຊ
ղੳͰɺࢠτϦΨʔͱ༻ΔͱΒτϦΨʔͰͷཁٻͰΔrsquotightrsquo ͷ ID Λཁٻ
Δɻ LQ དྷͷࢠͳӡಈΛΔΊɺpT gt 25GeV |η| lt 247 Λཁ
ΔɻͰͷٻ pT ΧϩϦϝʔλͷΤωϧΪʔͱτϥοΫͱΫϥελʔͷʹΑਖ਼
ΕΔɻɺݕग़ثͷஔΑΓ EM ΧϩϦϝʔλͷͳҬ (137 lt |η| lt 152) veto
ΔɻࢠͷपΓʹࢠͳͱΛཁٻΔ Isolation τϦΨʔͰΔΊʟ
FixedCutTightTrackOnlyrsquoͱཁٻΛΔ [23]ɻ
312 ϛϡʔΦϯ (micro)[24]
ϛϡʔΦϯಠʹ෦ඈݕग़ثͱϛϡʔΦϯݕग़ثͰߏΕΔɻ2 ͷτϥοΫ
ͷҐஔͱӡಈͰϚονϯάΛऔΔɻಉϑΟοτΔͱͰӡಈΛଌఆΔɻࢠͱಉ
ʹϛϡʔΦϯ pT gt 25GeV |η| lt 27 ΛཁٻΔɻ ID rsquoloosersquoɺIsolation ʟ
FixedCutTightTrackOnlyrsquoཁٻΔɻ
ҎɺࢠͱϛϡʔΦϯͷͱΛ૯শϨϓτϯ (l)ͱݺͿɻ
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
![Page 26: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/26.jpg)
ୈ 3ষ ಉఆࢠ 25
313 δΣοτ (jet)
δΣοττϙϩδΧϧΫϥελʔΑΓ anti-kt4 ΞϧΰϦζϜΛ༻ߏΕΔ [25]ɻ
ɺύΠϧΞοϓདྷͷδΣοτΛΔΊʹɺpT lt 60GeV |η| lt 24ͷδΣοτ
ʹରɺτϥοΫใΑͼিಥΛར༻ Jet Vertex Tagger(JVT)Λ༻Δ [26]ɻδΣο
τʹ pT gt 25GeV |η| lt 25ΛཁٻΔɻ JVTͷΧοτʹର 92ͷλά
ͷϙΠϯτΛ༻Δɻ
314 bλάδΣοτ (b-jet)
bΫΥʔΫདྷͷδΣοτ BதࢠणͰΔΊʹ ͱಛյΛ2
ΔɻͰɺ313Ͱఆ jetΛΠϯϓοτͱMV2 ͱଟมղੳΛ༻ΞϧΰϦζ
ϜΛ༻Δ [27]ɻຊղੳͰɺ77ͷλάͷ bλάδΣοτΛ༻ΔɻͷϙΠϯτͷআڈ
ϑΝΫλʔɺc-jetɺtauདྷͷ jetɺlight quarkདྷͷ jetʹରΕΕɺ16ɺ113Ͱ
Γɺc-jetΑͼ tauདྷͷ jetͱͷผͷΘΔɻ
315 ফԣӡಈ (MET)
ཅࢠཅࢠিಥͰॎͷΤωϧΪʔอଘͳԣͷΤωϧΪʔอଘΔɻͷ
ͱΛར༻χϡʔτϦϊͳͲͷݕग़Ͱͳࢠফԣӡಈ (MET Missing Transverse
Energy)ͱߏΕΔɻͷΊऴঢ়ଶʹෳͷχϡʔτϦϊग़ΔաఔͰϕΫτϧͷ
ͷΈଌఆͰͳɻɹܭ
316 Overlap removal
ͰɺΦϒδΣΫτͷߏΑͼఆΛड़ɻॏෳΦϒδΣΫτΛΧ
ϯτΔͱΛΊʹɺ(22)Ͱఆ ∆RΛ༻ΦϒδΣΫτͷઌॱҐΛҎԼ
ͰఆΔɻ
bull e-micro ∆R lt 01ͷͱ eΛআ
bull e-τhad ∆R lt 02ͷͱ τhad Λআ
bull e-jet ∆R lt 02ͷͱ jetΛআ
bull micro-τhad ∆R lt 02ͷͱ τhad Λআ
bull micro-jet ∆R lt 02ͷͱ jetΛআ
bull τhad-jet ∆R lt 02ͷͱ jetΛআ
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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ݙจߟ 54
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[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
![Page 27: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/27.jpg)
ୈ 3ষ ಉఆࢠ 26
32 ϋυϩϯʹյΔ τhad ͷߏ
ϨϓτϯյΔ τ ϨϓτϯͱߏΔɻϋυϩϯʹյΔ τ(τhad)ϋυϩϯͷଋ
ͱଌΕΔΊ τhad ͷಉఆଞͷϨϓτϯͱൺɻτhad ΧϩϦϝʔλͱ෦
ඈݕग़ثͷใΛߏΕΔɻେͷಛࡉίʔϯͰյɺͷࡉҬʹՙ
ࢠ 1 (1-prong) 3 (3-prong)ΔͱɻͷಛΛར༻ τhad ಉఆΕΔ [28]ɻ
δΣοτͱಉͰߏ anti-kt ΞϧΰϦζϜΛ seedͱΔɻͰɺpT 25GeVҎͰ
ΔͱΛཁٻΔɻɺτhad ͷߏʹτϥοΫͷใॏཁͳͷͰ෦ඈݕग़ثͷײ
ҬͰΔ |η| lt 25ͷΛཁٻΔɻޙʹ τhad ͷॏཁͳಛͰΔ 1-prongɺ3-prongΛཁ
༺ΔɻͷτϥοΫͷબଟมղੳΛٻ conversion τϥοΫύΠϧΞοϓདྷͳͲ
ͷϑΣΠΫͱͳΔτϥοΫͱผΔɻ
321 τhad ͷಉఆ
τhad ͷഎܠͱͳΔͷ QCDདྷͷδΣοτͰΔɻͷδΣοτ τhad ͱߏ
ΕϑΣΠΫͱผΔΊʹɺଟมղੳ BDT(Boosted Decision Tree)ͱΞϧΰϦζ
ϜΘΕΔɻ1-prongɺ3-prongͰҟͳΔมΛ༻ΓΕΕ 9ɺ10ͷมΒͳΔ
[29]ɻBDT ͰΧοτ؇ (γάφϧഎܠଟΧοτ) Β looseɺmediumɺtight
ͷΑͳ 3 ͷΛ༻ҙΔɻͷͱʹΑΓɺղੳʹγάφϧͱഎܠͱͷ
ͶΒదͳͷΛબͿͱΛՄʹΔɻɺ৴ τhad ͷ pT ͱύΠϧΞο
ϓ lt micro gtʹରϑϥοτʹΔ (ਤ 32)ɻͷΊɺผಉϙΠϯτͰ τhad
ͷ pT ͱύΠϧΞοϓ micro ʹΑҟͳΔɻLoose ʹΔ rejection ΛਤʹɻͷΑʹɺ
low pT ͱ high pT Ͱେ 6ഒผҟͳΔɻॏࢠ୳ࡧͰ৴Λߴ
τhad ͷϑΣΠΫΛΔͱʹͳΔɻ
ਤ 31 ϙΠϯτʹΔ τhad ͷ ID
ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
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[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
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EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
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U
L
L
U
U
L
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R L L
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L LL U
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ୈ 3ষ ಉఆࢠ 27
ਤ 32 LooseʹΔ τhad IDͷ rejection
322 ࢠ veto
ࢠ 1-prongͷ τhad ʹରഎܠͱͳΔɻͷࢠͷഎܠΛআΊʹ τhad ͷಉ
ఆͱಉʹ BDTΛ༻Δ [29]ɻ η ҬͷࢠʹରΔ RoC curveΛਤ 33ʹɻͷਤ
ΒΘΔΑʹ η ʹରେґଘΛɻΕΒͷ η ʹରɺࢠ vetoͷϙΠϯτͱ
৴ 95ͷ vetoΛ༻ɻ
ਤ 33 τhad ͷ eVetoʹରΔ RoCΧʔϒ [29]
28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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28
ୈ 4ষ
બ
41 ৴ͷಛ
τοϓΫΥʔΫͱλϨϓτϯΕΕॏΫΥʔΫͱϨϓτϯͰΔΊݕग़ثʹೖ
ΔલʹյΔɻλࢠऑ૬ޓ༻ͷՙΧϨϯτWplusmn ΛհϋυϩϯϨϓτϯ
ʹյΔɻɺͷյʹλχϡʔτϦϊ ντ ਵΔɻಉʹτοϓΫΥʔΫWplusmn
ΛհϋυϩϯϨϓτϯʹյΔɻɺsim100ͷͰ b-quark ʹյΔɻ
τοϓΫΥʔΫରΑͼλࢠͷյϞʔυΑͼյذൺΛਤ 41ͱਤ 42[3]ɻͷΑʹ
τοϓͱλΕΕଟͷऴঢ়ଶΛΊ LQLQ rarr tτ tτ աఔͰͷίϯϏωʔγϣϯʹ
ΑMETΉෳͳऴঢ়ଶͱͳΔɻ
ਤ 41 ttͷյϞʔυͱذൺਤ 42 τ ͷյϞʔυͱذൺ
80ͷऴঢ়ଶʹগͳͱ 1ͷϨϓτϯଘࡏΔͷͰτϦΨʔʹɺ
؆୯ͳγϯάϧϨϓτϯτϦΨʔΛ༻ΔɻϨϓτϯτϦΨʔͷӡಈͷɺϧϛϊγςΟʹ
ΑมΘΔΊҟͳΔΛ༻Δɻຊղੳʹ༻ΔͱͷϨϓτϯτϦΨʔΛද 41ʹ
ͱΊΔɻ
ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
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L LL U
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ୈ 4ষ બ 29
Year Ϩϓτϯ τϦΨʔϝχϡʔ
2015 ࢠ HLT e24 lhmedium L1EM20VH or HLT e60 lhmedium or HLT e120 lhloose
2015 ϛϡʔΦϯ HLT mu20 iloose L1MU15 or HLT mu40
2016લ ࢠ HLT e24 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2016લ ϛϡʔΦϯ HLT mu24 ivarmedium or HLT mu40
ޙ2016 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
ޙ2016 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2017 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2017 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
2018 ࢠ HLT e26 lhtight nod0 ivarloose or HLT e60 lhmedium nod0 or HLT e140 lhloose nod0
2018 ϛϡʔΦϯ HLT mu26 ivarmedium or HLT mu50
ද 41 ຊղੳʹ༻ϨϓτϯτϦΨʔϝχϡʔ (nod0 ͷτϥοΫʹରΔࢠ d0 ͷΧο
τΛཁٻͳ ivar isolationͷཁ[30](ٻ
؆୯ʹ৴ͷಛΛҎԼʹͱΊΔɻ
bull ෳͷϨϓτϯɿτϦΨʔʹ༻ΔɻϋυϩϯίϥΠμʔʹࢧతͳഎܠͰΔQCDΛେ෯ʹͰΔɻ
bull b-jet topͷյͰ sim100ͷͰ b-quarkʹյΔͷͰ 2ͷ b-jetଘࡏΔɻ
bull ӡಈͷߴ τhad ॏ LQΒ τ ʹյΔͷͰߴӡಈΛɻɺਤʹ
Αʹ τ ϋυϩϯͷյذൺେɻ
bull ෳͷχϡʔτϦϊ ऴঢ়ଶʹඞෳͷχϡʔτϦϊଘࡏΔɻͷΊMETେ
ͳΔɻɺԣʹΔϕΫτϧͷΈߏΕΔͷͰখͳΔଟɻ
bull ෳͷδΣοτɿϨϓτϯൺతগͳ ttϋυϩϯʹյΔͱʹͳΓδΣο
τଟͳΔɻɺτ ͱߏͰͳδΣοτͱߏΕΔɻ
411 ΔMC༺
ຊղੳʹ༻৴αϯϓϧ MadGraph5 aMCNLO[31] (version 243) Λ༻ [32]
ͷεΧϥʔ LQ ϞσϧΛ༻ੜΔɻɺύʔτϯ (PDF) NNPDF 30
NLO[33]Λ༻ΔɻϋυϩφΠθʔγϣϯͱύʔτϯγϟϫʔʹ PYTHIA 8212ͱ A14Λ
༻Δ [34]ɻLQͷյʹMadspin[35]Λ༻ΔɻLQͷյ෯ λʹґଘΔɺLQͷ
ʹର lt 1ͰΔΊݕग़ثͷղͱൺΔͱ΄ͱΜͲແࢹͰΔɻ༻αϯϓϧͰ
λ = 03Λ༻ (ͷ 02)ɻLQͷ 05 09 13 17TeVͷ 4ͷαϯϓϧΛ
༻ҙΔɻΕΕͷʹରΔඍஅ໘Λද 42ʹͱΊΔɻ
ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 4ষ બ 30
LQ mass(TeV) ඍஅ໘ (fb)
05 49065
09 11679
13 06990
17 00611
ද 42 εΧϥʔ LQͷඍஅ໘ [30]
42 ΧςΰϦʔ
ຊղੳͰɺ৴ײΛେԽΔΊʹୈ 3 ষͰఆϨϓτϯͷͱ τ ͷΑͼΦϒ
δΣΫτͷՙͷ (OS Opposite Sign SS Same Sign)Λ༻ ͷΧςΰϦʔʹݸ10
Δɻɺoffline levelͷΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυΛਤ 43ʹɻਤͷϨ
δΣϯυͷ XYͷ X ττ ͷյΛදɺY ttͷյΛදɻlϨϓτϯյɺhϋυϩ
ϯյΔ τɺqWΒ qqʹյΔͷΛදΔɻɺ৴αϯϓϧͷ 09TeV
13TeVͰ΄ͱΜͲҧͳɻ10ݸͷΧςΰϦʔͷࡉΛҎԼʹͱΊΔɻ
bull 1l1τ OS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ OSΛཁٻɻ৴ɾഎܠ
ଟɻਤ 43ͷ truthใΒΘΔΑʹࡍʹ 2ϨϓτϯΔͷ 2τ Δͷͳ
ͲߏΛഊͷͳͲଟΕΔͷಛͰΔɻ
bull 1l1τ SS Ϩϓτϯͱ τ ΕΕਖ਼ʹ 1Ͱ SSΛཁٻɻ
bull 1l2τ OS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ OSɻ
bull 1l2τ SS 1Ϩϓτϯͱ τ 2ҎΛཁٻɻߴӡಈͷ 2ͷ τ SSɻ৴ඇ
ৗʹগͳɺΩωϚςΟΫε 1l2τ OS ͱঢ়ଶΛΊͷഎܠͷݟΓʹର
ΔݕҬͱ༻Δɻ
bull 2l SS 2ͷϨϓτϯʹ SSΛཁٻɻɺதʹ τ ͳͱΛཁٻɻ
bull 2l1τ OS 2ͷϨϓτϯʹ OSΛཁٻɻ1ͷ τ Λཁٻɻ
bull 2l1τ SS 2ͷϨϓτϯʹ SSΛཁٻɻ2ͷϨϓτϯͱ OSͷ τ Λཁٻɻ
bull 2l2τ 2ͷϨϓτϯͱ 2Ҏͷ τ ΛཁٻɻΦϒδΣΫτͷΈͷཁٻͰ΄ͱΜͲͷഎܠ
མͱΔΊՙͷཁٻͳɻ
bull 3l 3ҎͷϨϓτϯΛཁٻɻશϨϓτϯͷՙͷܭͷઈର 1ΑΓখͱΛ
ཁٻɻ
bull 3l1τ 3lΧςΰϦʔʹՃ 1Ҏͷ τ Λཁٻɻ
ͷ దԽΔɻબΛʹΊΔΊߴΛײͷΧςΰϦʔͰ৴ݸ10
ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 4ষ બ 31
ਤ 43 ΧςΰϦʔʹΔ truthͷ tτ tτ յϞʔυ ਤࠨ) 09TeV ӈਤ 13TeV)
421 എܠ
৴ʹෳͷ τ ΛΉϨϓτϯଘࡏΔΊഎܠͷଟʹऴঢ়ଶʹෳͷϨϓ
τϯΛഎܠΔɻओͳഎܠΛҎԼʹͱΊΔɻ
bull τοϓΫΥʔΫରੜաఔ +jets (tt+jets)
શνϟϯωϧͰࢧతͳഎܠͱͳΔͷͷաఔͰΔɻऴঢ়ଶʹຊͷϨϓτϯ
ෳΔʹɺ৴ͱಉʹ 2ͷ b-jetΛऴঢ়ଶʹͷͰɺ৴ͱͷผ
ͳΔɻ৴ͱൺΔͱ τ ϑΣΠΫͳͷδΣοτগͳͱڍΒ
ΕΔɻ
bull ZϘιϯੜաఔ +jets (Z+jets)
2 ϨϓτϯνϟϯωϧͰ Z ϘιϯϨϓτϯյΔഎܠͱͳΔɻɺ
b-jetΛͳͱͱ 2ͷϨϓτϯʹΑΔෆมM(lep lep) 90GeVʹͱΛ
ར༻ͷഎܠΛΔͱͰΔɻ
bull WϘιϯੜաఔ +jets (W+jets)
ऴঢ়ଶʹϨϓτϯ 1ͳΊഎܠʹͳΓΒɻɺੜஅ໘େ
Ίʹ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻ
bull τοϓΫΥʔΫ୯Ұੜաఔ +jets(+V) ((t+jets(+V)))
ͷաఔ 1ϨϓτϯνϟϯωϧͰແࢹͰͳഎܠͱͳΔɻಛʹ t+Z+qաఔ৴
ΔɻͱܠΊʹഎͱঢ়ଶΛ
bull τοϓΫΥʔΫରੜաఔ +Ϙιϯੜաఔ (tt+V)
ੜஅ໘ͱඇৗʹগͳऴঢ়ଶ৴ͱશಉͰΔΊʹɺબΛ
എܠͱΔɻɺϘιϯ ττ ʹյΔͷ 2ͷ τ
ʹΑΔෆมM(τ τ)χϡʔτϦϊΛআ 60GeVʹϐʔΫΛͱΒͷ
എܠΛΔͱͰΔɻ
ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 4ষ બ 32
bull di-Ϙιϯੜաఔ (VV)
VVϨϓτϯʹյΔد༩ϨϓτϯͷཁٻͷΈͰଟΔ jetͱ b-jetͷཁٻʹ
Α΄ͱΜͲͷΛআͱͰΔɻ
ΕΒͷഎܠΛ৴ײΛߴΊΔΊʹશΧςΰϦʔڞ௨ͷ PreselectionΛΊΔɻ
422 Preselection
41 ͱ 421 Ͱ৴ͱഎܠͷಛΛར༻ɺશνϟϯωϧڞ௨ͷ
Preselection Λද 43 ʹͱΊΔɻτϦΨʔ 41 ͰγϯάϧϨϓτϯτϦΨʔΛ༻
ΔɻɺGood Runͱ Good EventͰͱͷݕग़ثͳͲΒΔ bugΛऔΓআɻLQ
ΒյΔ τ ߴӡಈͰΔΊ 50GeVҎͷཁٻΛΔɻ
ͷ Preselection ΛਤܠͱഎͷΧςΰϦʔʹΔ৴ޙ 44 ʹɻTop ͷ
༩ʹد tt+jets ʹՃτοϓΫΥʔΫ୯Ұੜաఔ 4 τοϓΫΥʔΫੜաఔͳͲ
ΕΔɻਤ 17 ͰΑʹ CMS ΕΔΊغʹطͰ΄ͱΜͲͷҬݧ
BR(LQ rarr tτ)ΛখͱΛԾఆΔɻΑɺ৴αϯϓϧͷ 05TeVαϯϓϧʹ
BR(LQ rarr tτ) = 02ʹεέʔϧɺͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1ͱԾఆ
Δɻ
Χοτ Χοτ༰
Trigger γϯάϧϨϓτϯτϦΨʔ
Good Run pass Good Runs Lists
Good Event શݕग़ث Good Condition amp No Bad Jet
Primary Vertex at least 1 PV
Lepton at least 1 lepton pT gt 30GeV
τ at least 1 τ pT gt 50GeV (2l SSɺ3lνϟϯωϧআ)
Njets ge 2 (pT gt 25GeV passJVT)
Nbjets ge 1 (77 Working Point)
ද 43 શΧςΰϦʔͷ Preselection
ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
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[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
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[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
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U
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U
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L
U
R L L
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L LL U
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ୈ 4ষ બ 33
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510
610
710
810LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Preselection
ਤ 44 Preselection ʹΔΧςΰϦʔͷ৴ͱഎܠ (05TeV αϯϓϧ
BR(LQ rarr tτ) = 02 ʹεέʔϧɻͷଞͷ৴αϯϓϧ BR(LQ rarr tτ) = 1 ͱԾఆ
Δɻ)
43 ৴Ҭ
৴ײ SradicB ʹΑ৴ҬʹΔબΛదԽΔɻΧςΰϦʔʹΔ৴
ҬͷબΛද 44 45ʹͱΊΔɻ
Χοτ 1l1τ OS 1l1τ SS 1l2τ 2l1τ OS 2l1τ SS
Jet Selection ge 5jets ge 4jets ge 3jets
τ pT (GeV ) gt 150 gt 100 gt 50 gt 100
τ ID 1 Tight τ 2 Loose τ 1 Tight τ
Mass (GeV ) M(l τ) gt 150 M(τ τ) gt 150 M(l l) lt 80M(l l) gt 100
MET(GeV) gt 100 gt 50 no cut gt 100 gt 30
Fit Variable Meff
ද 44 ৴ҬʹΔબ 1
ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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ݙจߟ 54
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icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 4ষ બ 34
Χοτ 2l2τ 3l 3l1τ
Jet Selection ge 2jets
τ pT (GeV ) gt 50 gt 50 no cut gt 50
τ ID 2 Loose τ no cut 1 Tight τ
MET(GeV) gt 50
Meff (GeV) gt 1000
Fit Variable
ද 45 ৴ҬʹΔબ 2
৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠΛਤ 45 ʹɻগͳΧ
ςΰϦʔͰ୯७ʹͷΈͰϑΟοτΔɻҰɺഎܠଟΔΧςΰϦʔʹ
ΛϑΟοτΔɻͰɺऴతʹϑΟοτʹมɺMeff ʹड़Δɻ
Meff ΦϒδΣΫτͷ pT ͷεΧϥʔܭʹMETΛՃͷʹͳΔɻͷม৴
ΛΔͱͰΔมͰΔɻMeffܠͱഎ ҎԼͰఆΕΔɻ
Meff = ΣplepT + ΣpτT + ΣpjetsT +MET (41)
ͷมΛ༻ɺ1l1τ OS 1l1τ SS 1l2τ OS 2l1τ OS νϟϯωϧͰMeff ͰϑΟο
τΔͱͰ৴ײΛݟΔɻνϟϯωϧͷMeff Λਤ 46Βਤ 49ʹɻ
OSτ1l1 SSτ1l1 OSτ1l2 SSτ1l2 2l SS OSτ2l1 SSτ2l1 τ2l2 3l τ3l1
Even
ts
1minus10
1
10
210
310
410
510LQ(05TeV) LQ(09TeV)LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
InternalATLAS-1=13TeV 140 fbs
Signal Region
ਤ 45 ৴ҬʹΔΧςΰϦʔͷ৴ͱഎܠ
ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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ݙจߟ 53
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[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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U
L
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U
U
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ୈ 4ষ બ 35
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 46 1l1τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV2minus10
1minus10
1
10
210
3101l1tau SS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 47 1l1τ SS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau OS
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 48 1l2τ OS νϟϯωϧʹΔMeff
Meff500 1000 1500 2000 2500 3000
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
2l1tau OS tight
-1=13TeV 140fbs InternalATLAS LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV)top W+jetsZ+jets ttVVV MC stat
ਤ 49 2l1τ OS νϟϯωϧʹΔMeff
36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
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[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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36
ୈ 5ষ
എܠͷධՁ
4 ষͰ MC ʹΑഎܠͷݟΓΛߦɻಛʹ৴ײͱظΕ
Δͷ 1l2τ OS νϟϯωϧͰΔɻͰɺͰಛʹ 1l2τ OS νϟϯωϧʹΔഎܠ
ͷධՁΛɻMCʹΑΔഎܠͷݟΓͷϞσϦϯάͷଥͷݕͱɺ1l2τ OS
νϟϯωϧͱඇৗʹҬͰ৴ͷײͳ 1l2τ SS νϟϯωϧͷͷΛߦɻ
ɺͳܭͰMCͱσʔλͷΛൺΔΊʹ τ ͷ pT ͷΧοτΛ 10050GeV
Β 5025GeVʹ؇ΊΔɻͰɺ2016Ͱʹऔಘσʔλ 36fbminus1 Λ༻Δɻ
Meff ΛߏΔΛਤ 51Βਤ 56ʹɻͷΑʹɺMeff ʹΔͷMCʹ
ΑΔϞσϦϯάσʔλΛݱΔͱΘΔɻͷҬͰ΄ͱΜͲ ttདྷͷഎ
ʹͱͳΓɺಛܠ τ QCDདྷͷϑΣΠΫͷͷͱຊͷͷͰΔɻ৴
ߦΛܭΛͳΔམͱͳΑʹղੳઃ τ ͷ IDΛ LooseʹઃఆΔΊɺ2ͷ
τ ϑΣΠΫͷଟɻͷΊ τ ͷϑΣΠΫʹରΔධՁॏཁͰΔɻಛʹߴӡ
ಈͷ τ ʹରΔϑΣΠΫͷධՁΛߦɻ
20
40
60
80
100
120
140
Even
ts
100G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
100 200 300 400 500 600 700 800 900 1000HT_jets
0608
11214
data
exp
ਤ 51 શδΣοτͷ pTͷܭ
ͷ(GeV)
20
40
60
80
100
120
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250met
0608
11214
data
exp
ਤ 52 MET (GeV)
50
100
150
200
250
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
50 100 150 200 250Lead_tau_pT
0608
11214
data
exp
ਤ 53 τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
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[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
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[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
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EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
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L LL U
U U
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ୈ 5ষ എܠͷධՁ 37
50
100
150
200
Even
ts
125
GeV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 20 40 60 80 100 120 140Second_tau_pT
0608
11214
data
exp
ਤ 54 τhad ͷ pT 2(GeV)
20
40
60
80
100
120
140
160
Even
ts
25G
eV
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 50 100 150 200 250lepton_pT
0608
11214
data
exp
ਤ 55 leptonͷ pT (GeV)
50
100
150
200
Even
ts
1l2tau SS loose -1=13TeV 360 fbs
InternalATLAS LQ(1TeV) Datatt(t+f) tt(2fake)Others(t+f) Others(2fake)true tau All bkg stat
0 1 2 3 4 5 6 7 8 9 10n_jets
0608
11214
data
exp
ਤ 56 δΣοτ
51 Fake Rate method
MCͷϞσϦϯάσʔλΛݱΔͱΛMCϕʔεͰͷഎܠͷݟ
ΓՄͰΔͱΘΔɻݱঢ়ͷͱߴӡಈҬʹΔ MC ͷܭ
Γͳͱͱɺτ ͷ ID ͷϑΣΠΫʹରΔෆఆΛධՁΔڍΒΕΔɻͰɺ
δΣοτ τ ʹϑΣΠΫΔ (FR Fake Rate) ΛσʔλͰਖ਼ʹଌఆΔͱͰΕΒͷ 2
ͷΛಉʹղͰΔΛΔɻFRҎԼͰఆΕΔɻ
FRdata =Ndata(passID)minusNMC(τ =j)(passID)
Ndata(all)minusNMC(τ =j)(all)(51)
FRMC =NMC(τ =j)(passID)
NMC(τ =j)(all)(52)
FRΛଌఆΔΊʹϑΣΠΫௐҬͱɺ1l1τ ͷνϟϯωϧΛ༻Δɻ৴ҬͱҟͳΓ৴
ҬΛબΔΊʹMETײ lt 100GeV ΛཁٻΔɻɺMET lt 100GeV ͷ 1l
ܠͷνϟϯωϧͰɺQCDདྷͷഎࢠ 10ఔΔɻͰ QCDདྷͷഎܠ
ແࢹͰΔϛϡʔΦϯͷνϟϯωϧͷΈΛ༻Δͱͱɻ1-3-prongʹΔ τ IDલޙͷ τ
ϑΣΠΫௐҬʹΔ τ pT ΛਤʹɻͰ ttͷഎܠͷɺຊͷ τ ͱϑΣ
ΠΫ τ ΛΔɻਤʹΑʹ τ ͷຊͰΔೖΔͷͰ 51
ͷ FRdata ʹຊͷ τ ͷMCͰݟΛҾͱͰଌఆΔɻɺ3
ষͰड़Αʹ τ ͷ ID pT η τϥοΫʹґଘΔɻͰ 3ͷมΛ FRͷύϥ
ϝʔλʹ༻ग़ɻFRͷଌఆՌΛਤ 58Βਤ 513ʹɻ
ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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ୈ 5ষ എܠͷධՁ 38
ਤ 57 τ ϑΣΠΫௐҬʹΔ τ pT ਤ1-prongࠨ) IDલ ӈਤ1-prong IDޙ
Լਤࠨ 3-prong IDલ ӈԼਤ 3-prong IDޙ)
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 58 1-prongʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 59 3-prongʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 510 1-prong low |η|ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) barrel njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 511 3-prong low |η|ʹΔ FR
Fake
Rat
e
0
005
01
015
02
025
03τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (1p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 512 1-prong high |η| ʹΔ FR
Fake
Rat
e
0
002
004
006
008
01τMC Fake
Data 2015+2016
InternalATLAS-1=13TeV 36 fbs
Top CR (3p) endcap njgt=3
[GeV] T
Offline Tau p50 100 150 200 250 300
Dat
a M
C
0608
11214
ਤ 513 3-prong high |η| ʹΔ FR
ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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L
L
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L
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ୈ 5ষ എܠͷධՁ 39
ͰɺFRͷҧΛධՁΔΊʹMCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FRͷ
ൺΛɻ
ਤ 514 MCΛ༻৴ҬͱϑΣΠΫௐҬʹΔ FR
Ίٻ FRΛ༻ͷΑʹMCʹΑΔഎܠͷݟΓʹରਖ਼Λߦɻ
N(background) = FRtimesMC(1true 1fake) + FRtimes FRtimesMC(2fake) +MC(2true) (53)
ͷΑʹΦϒδΣΫτຖʹ FRΛΔͱʹΑϑΣΠΫʹରΔMCͷෆఆͷܥޡ
ΛධՁΔͱͰΔɻͰɺਤ 514Ͱͷ FRͷҧΒϑΣΠΫ τ ͷܥޡͱ
τ pT ͷޙͷϏϯҎʹ 30ɺޙͷϏϯʹର 50ͷޡΛܭΔͱͰϑΣΠΫʹର
ΔMCͷෆఆΛѻΔͱظͰΔɻ
52 എܠͷݟΓͷݕ
σʔλͰग़ FRʹΑ (53)ʹΑʹMCʹ weightΔͱʹΑΓߴӡಈ
ҬʹΔMCͷܭෆղফΕɻͰɺߴӡಈҬ (τ pT gt 100 50GeV )ʹΔ
σʔλͱ FRʹΑΔਖ਼ޙͷMCͷൺΛਤ 515Βਤ 520ʹɻ
Even
ts
200G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
HT_jets200 400 600 800 1000 1200 1400
data
MC
051
152
253
ਤ 515 FR ʹΑΔਖ਼ޙͷ
શδΣοτͷ pTͷܭͷ
(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
met0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 516 FR ʹΑΔਖ਼ޙͷ
MET (GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Lead_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 517 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 1(GeV)
ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
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[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
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data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
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EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
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[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
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[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
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[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
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[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
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L
R U U
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ୈ 5ষ എܠͷධՁ 40Ev
ents
25
GeV
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
Second_tau_pT60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 518 FR ʹΑΔਖ਼ޙͷ
τhad ͷ pT 2(GeV)
Even
ts
25G
eV
2minus10
1minus10
1
10
210
310
410
1l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
lepton_pT0 20 40 60 80 100 120 140 160 180 200
data
MC
051
152
253
ਤ 519 FR ʹΑΔਖ਼ޙͷ
leptonͷ pT (GeV)
Even
ts
2minus10
1minus10
1
10
210
3101l2tau Loose SS
-1=13TeV 361 fbs InternalATLAS Data LQ(05TeV) LQ(09TeV)
LQ(13TeV) LQ(17TeV) topW+jets Z+jets ttVVV MC stat
n_jets2 3 4 5 6 7 8 9 10
data
MC
051
152
253
ਤ 520 FR ʹΑΔਖ਼ޙͷδ
Σοτ
41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
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41
ୈ 6ষ
༧৴ײΑͼݶ
61 CLS
৴ҬʹΔMeff Λ༻ɺظΕΔεΧϥʔ LQʹରΔݶΛ
ग़ΔɻͰݶͷܭʹ CLS [37]Λ༻ΔɻɺҎԼͷ Poissonͱ GaussΛ༻
likelihoodΛఆΔɻ
L(n θ0|micro θ) =prod
iisinbins
P (ni|microS(θ) +B(θ))timesprod
jisinnp
G(θ0j |θj) (61)
nظΕΔΠϕϯτͰɺmicroϑΟοτͰٻΊ৴ڧͰΓ iϏϯ jNuisance
Parameter(NP)ͷ θ NPΛදΔɻmicroͷ৴ڧʹΑཧʹରΔݶΛग़
Δɻଓݕఆ qmicro Λ microʹͷΈґଘΔͷͱɺҎԼͷΑʹఆΔɻ
qmicro = minus2LogL(micro ˆθ)L(micro θ)
(62)
Ͱɺmicro 0 le micro le microͱΔɻͷݕఆΛ pseudoݧʹΑग़ qmicro Β microʹର
Δ P (qmicro|micro)(PDFProbability Density Function) ΛಘΔͱͰΔɻͷ
தԝΒ qmicro ΛಘΔɻɺSignal+Backgroundͱ Background Onlyͷ p-valueΛΕΕҎ
ԼͷΑʹͰܭͰΔɻ
ps+b =
int infin
qmicro
P (qmicro|micros+ b)dqmicro (63)
pb =
int infin
qmicro
P (q0|b)dqmicro (64)
ͷ 2ͷ p-valueΑΓɺCLS ΛఆΔɻ
CLS =ps+b
pb(65)
ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
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L LL U
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ୈ 6ষ ༧৴ײΑͼݶ 42
CLS 005ͱ 95 Confidence LevelͷݶͱͳΔɻҎɺຊڀݚͰغͷఆΛ 95CL
ͱΔɻ
62 ϨϓτΫΥʔΫʹରΔݶ
CLS Λ༻εΧϥʔ LQʹରΔݶΛܭΔɻ
621 1l2τ OS νϟϯωϧ
Ͱɺײ 1l2τ OS νϟϯωϧ୯ಠͷҬʹΔεΧϥʔ LQʹରΔ
Λड़Δɻ5ݶ 6ষͰΑʹɺͷνϟϯωϧͰMeff Λ༻ϑΟοτ
ΔɻࡏݱͰͷڀݚͰɺܥޡͷݟΓͰͳΊɺͰ NP Λഎܠʹ
ର 50ɺ৴ʹର 30ͱ 2ͷ NPΛ༻غҬΛग़ɻɺਤ
61ʹεΧϥʔ LQͷͱஅ໘ʹରΔغҬΛɻͰɺۂઢ 411Ͱ༻
MCʹΑΔੜஅ໘ΛɺLQͷյذൺ 100topͱ τ ͱΛԾఆΔɻߦʹ
ͷԾఆͷͱͱ 95 CLͰ 12TeVఔͰغΔͱΘΔɻ
500 1000 1500 [GeV]LQm
3minus10
2minus10
1minus10
1
) [pb
]τ t
rarr(L
Q
2BRtimes
LQσ
ATLAS Internal -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2Expected 95 CL
σ 1plusmnσ 2plusmn
=1 βPrediction LO
ਤ 61 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱஅ໘ʹରΔݶ
ҰͰɺΑΓॏཁͳͷ BR(LQ rarr tτ)ҬॏཁͰΔɻਤ 62ʹεΧϥʔ LQͷ
ͱ BR(LQ rarr tτ)ʹରΔۂغઢΛɻਤ 17ͱൺΔͱͷ 1ͷνϟϯωϧͰେ
վળΔͱΘΔɻ
ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
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[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
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[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
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JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
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EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
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[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
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[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
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[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
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[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
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[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
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[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
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[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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L
R U U
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U
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U U
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ୈ 6ষ ༧৴ײΑͼݶ 43
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Work in Progress -1 = 13 TeV 140 fbs
channelhadτLQLQ 1l2
Expected 95 CL
ਤ 62 1l2τ OS νϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
622 શνϟϯωϧͷՌ
1l2τ OS ΧςΰϦʔͱಉͷͰɺMeff ͱΕΕͰಉϑΟοτΔɻ
Ͱܥޡഎܠʹର 50ɺ৴ʹର 30 ΛԾఆɺΕΕͷܥޡ
100 ૬ΛΔԾఆͰશνϟϯωϧʹΑΔಉϑΟοτΛߦɻΕΕͷνϟ
ϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQ ͷͱ BR ʹରΔݶΛਤ 63 ʹɻ
BR(LQ rarr tτ) = 05ʹରɺ105TeVఔͰغΔͱظΕΔɻޙࠓɺΕ
ΕͷνϟϯωϧʹΔదԽʹΑɺ৴ײΛߴΊΔͱॏཁʹͳΔɻ
500 1000 1500 [GeV]LQm
0010203040506070809
1)τ trarr
BR(L
Q
ATLAS Internal -1 = 13 TeV 140 fbs
Expected 95 CL
All Comb OSτ1l1 SSτ1l1 OSτ1l2 OSτ2l1 τ2l2
3l τ3l1
ਤ 63 ΕΕͷνϟϯωϧΑͼશνϟϯωϧʹΔεΧϥʔ LQͷͱ BRʹରΔݶ
ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 6ষ ༧৴ײΑͼݶ 44
63 BΞϊϚϦʔʹରΔߟ
1ষʹΔ BΞϊϚϦʔΒΕΔҬͱຊղੳʹΑغΕΔҬʹߟ
Δɻલड़Αʹ LQରੜաఔ λql ʹґΒͷΈʹґଘΔੜஅ໘ΛɺҰ
յذൺʹɺλql ʹґଘΔɻBΞϊϚϦʔͷ R(D(lowast))Βಛʹ λ23 ͱ λ33 ͱڧ
Δ LQ༧ΕΔɻͰɺҎͷͰɺͷଞͷΛ 0ͱԾఆΔɻΔͱɺ
LQͷյ LQ rarr tτ bν cτ sν ͷ 4ͷյϞʔυʹߜΒΕΔɻɺλ23 ͱܕ λ33 ͷܕ
յذൺ λ223 ͱ λ233 ͷൺͰΔɻͰɺ1ষͷʹฦΔͱɺR(D(lowast))Β༧ଌΕΔ
λ23 λ33 ΑͼMLQ ͷɺλ23λ33MLQ
≃ 03plusmn 0035 (66)
ͱͳΔɻΓɺͲΒͷ λql ΛݻఆΔͱΔMLQ Ͱ R(D(lowast))Βยͷ λql ఆ
ΔͱͰΔɻ
1ͷॏཁͳύϥϝʔλͱୈ 3ʹΔ LQ rarr tτ ͱ bν ͷյذൺͰΔ β
ΛಋೖΔɻβ
β =λ2qτ
λ2qτ + λ2qν(67)
ͱఆΔɻಉͷϢχόʔαϦςΟΛԾఆΔͱୈ 3 ʹΔ LQ ಉʹର
ՙϨϓτϯ typeͱதϨϓτϯ typeͱͷಉ (λqτ = λqν)ͰΔͱߟΔɻͰɺ
β = 05ΛϕϯνϚʔΫͱΛਐΊΔ ϑϦʔύϥϝʔλͰΓʹࡍ) 0-1ͷΛऔΓ
Δ)ɻβ=05ͱԾఆΔͱୈ 3ʹΔ LQͷյذൺԣΛMLQ ͱਤ 64ͱͳΔɻ
top bΫΥʔΫΑΓॏΊʹಛʹ LQͷҬͰ bottom typeͷյେ
ͳΔɻMLQ 1TeVΛΔͱ BR(LQ rarr tτ) ≃ 05ͱͳΓյذൺ 50ͱͳΔɻ
ਤ 64 β = 05ͷͷ LQͷյذൺ
Ҏ 4 ͷύϥϝʔλ λ23 λ33 MLQ β ΛಋೖɻΒɺຊղੳͰग़༧
ΕΔغҬͰΔਤ 63 ͷMLQ minus BR(LQ rarr tτ) ͷ 2 ฏ໘ͰΔɻύϥϝʔλଟݩ
ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
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ୈ 6ষ ༧৴ײΑͼݶ 45
ΔΊΕΕͷύϥϝʔλΛݻఆΛਐΊΔɻਤ 65 ʹ β = 05 ΛԾఆ B Ξ
ϊϚϦʔΒΕΔҬΛɻઢ λ33 ͷʹରΔ BΞϊϚϦʔΒҰҙʹ
ΔMLQ ͱ BR(LQ rarr tτ) ͷͰΔɻ ͰදҬ B ΞϊϚϦʔΒΕΔ
01 lt λ23 lt 05ͷҬͰΓɺઢ λ23 ͷʹରΔMLQ ͱ BR(LQ rarr tτ)ͷͰΔɻ
ͷΕΕͷઢΔ BΞϊϚϦʔΒ༧ଌΕΔ λ23 λ33 MLQ ͷͱͳΔɻ
ɺβ = 10ͷಛघͳέʔε (λqν ltlt λqτ )ʹਤ 66ʹɻવɺβ = 05ͱԾఆ
ΑΓଟͷύϥϝʔλεϖʔεʹײΓɺغΔҬେͳΔɻ
ਤ 65 εΧϥʔ LQ ʹରΔغҬͱ β =
05 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ਤ 66 εΧϥʔ LQ ʹରΔغҬͱ β =
10 γφϦΦʹΔ B ΞϊϚϦʔΒ
ΕΔҬ
ͷਤ 65ͱਤ 66ͷՌɺ140fbminus1 Ͱ LHCͰաݟʹޙࠓMLQ ͷͱੜ
அ໘ΑͼյذൺͳͲͷਫ਼ଌఆʹΑɺཧʹΔ 4ͷύϥϝʔλΛଌఆΔ
ͱՄͰΔͱΔɻɺޙࠓ Belle2ݧΕ R(Dlowast)কདྷਫ਼
ଌΒΕΔͱظΕΔ [38]ɻBதࢠͷਫ਼ଌఆͱΘޙࠓܭΛਫ਼Λ
Ίߴ LQͷଌఆظͰΔɻ
46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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46
ୈ 7ষ
ͱΊͱల
71 ͱΊ
BதࢠͷϨϓτχοΫյͷਫ਼ଌఆʹ ͰίώʔϨϯτʹඪ४ཧͷ༧ଌݧ3
ΒΕΔ B ΞϊϚϦʔʹΔɻͷ B ΞϊϚϦʔΛઆΔཧͷ
LQͰΔɻຊڀݚͰ BΞϊϚϦʔΒΕΔ LQͷ୳ࡧΛ LQରੜաఔ
τοϓΫΥʔΫͱλϨϓτϯʹյΔաఔ (LQLQ rarr tτ tτ աఔ)ʹɺͷղੳઃܭΛ
ΊϨϓτϯͱϋυϩϯյΔɻΕΕͷଟͷյϞʔυΛߦ τ ͷͰΧ
ςΰϦʔΛߦɺ৴ҬʹγϯϓϧͳબΛఆɻಛʹɺ৴ײߴ
1l2τOS ͰMCʹΑΔഎܠͲͷఔɺҰகΔͷΛΔΊʹ 1l2τSS Ͱσʔ
λͱͷൺΛߦɻɺ2τ ʹͰΔΊ τ ʹΔܥޡେΔͱ
༧ΕΔΊ τ ͷϑΣΠΫʹରΔධՁΛɻͷଞͷνϟϯωϧͰ SradicB Ͱద
ԽબʹΑɺಘΒΕ৴ҬͰഎܠൺతଟΔΧςΰϦʔʹ
Meff Ͱɺ ͷଞͷΧςΰϦʔͰͰϑΟοτΛɻΕΒΒಘΒΕՌͱɺ
BR(LQ rarr tτ) = 1 (BR(LQ rarr tτ) = 05)ʹର 13TeV(105TeV)Λ 95ͰغΔͷͰ
ΔɻͷՌ TeVҬͷ LQʹཧײΛͱΛΓɺLHCͷ୳ࡧʹ
LQͷஹݟΒΕΔͱظΕΔɻ
72 ͷలޙࠓ
6ষͰΑʹ LQͷॏҬ λ23 ͱ λ33 େҬʹ BΞϊϚϦʔΒ
༧ΕΔ LQͷҬΔɻޙࠓॏཁʹͳΔͷओʹ 3ͰΔɻ
721 ͷਫ਼ޡܥ
ୈҰʹrdquoਖ਼rdquoՌΛग़Ίʹܥޡͷਫ਼ॏཁͰΔɻݱঢ়ޡܭʹՃ
ԾతʹܥޡΛԾఆɻऴঢ়ଶʹଟͷΦϒδΣΫτΛΊʑͳܥޡ
௨ΔڞΒΕΔɻͲͷΧςΰϦʔʹߟ jetʹΔܥޡ Jet Energy Scale(JES)Ͱ
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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![Page 48: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/48.jpg)
ୈ 7ষ ͱΊͱల 47
ΔɻಛʹMeff Λ༻ΔΊɺjetͷ pT METͳͲӨڹΔ JESେӨڹ
Δͱ༧ΕΔɻଓ τ ʹΔܥޡେӨڹΔɻJES ͱಉʹ Tau Energy
Scale(TES)Meff ʹӨڹΛ༩Δɻɺߴӡಈͷຊͷ τ ʹରΔ ID Fakeʹର
Δ IDͷܥޡେͳΔՄΔɻʹ ttͷMCϞσϦϯάʹΑΔܥޡ
ͱ༧ΕΔɻMCΛ༻എܠͷݟΓΛߦΓɺradiationͷஅ໘
ͳͲʹܥޡΛݟΔඞཁΔɻMCϞσϦϯάܥޡͱΔʹ
ɺMCΛ༻ʹσʔλΛ༻എܠͷݟΓͳͲॏཁʹͳΔɻ
ΛԼΔޡܥΧςΰϦʔʹΔΛਫ਼ɺඞཁʹԠޡܥɺͲͷޙࠓ
ΊͷڀݚΛߦͱॏཁʹͳΔɻ
722 ղੳͷվળ
ߦͰڀݚঢ়ͷղੳͷվળͰΔɻຊݱͷਫ਼ͱಉʹॏཁʹͳΔͷޡܥ LQLQ rarrtτ tτ աఔͷղੳઃܭʹվળͷ༨ଟΔɻಛʹ 1l1τOS ΧςΰϦʔͰਤ 44ͱਤ
45ͷ৴ΛൺΔͱΘΔΑʹબʹΑ৴Λ 30 90Δ
ͱΘΔɻΕഎܠଟΔͰΔ 1l1τOS Ͱ৴ײΛେԽΔΊʹݱঢ়
ͷγϯϓϧͷΧοτͷΈͰӡಈͳͲͷͷΈΛߴɺ৴ΛݮΒΔͷݪҼͱ
ͳΔɻͷଞͷνϟϯωϧͰಉͳͱݴΔɻLQLQ rarr tτ tτ աఔଟͷߴӡಈͷ jet
ʹΔͷʹՃɺΕΒͷ1 jetͷΔΈΘ topͷʹϐʔΫΛͱ
ͷ topͱ τ Ͱߏ 2ͷ LQಉΛͳͲಛతͳΩωϚςΟΫεΛɻtopͷ
ߏ LQͷߏɺttܥͷߏͳͲʹΑӡಈͷҎʹ৴ײΛΔڀݚॏ
ཁʹͳΔɻΕΒͷߏͷ LQݟʹͷॏཁͱʹͳΔɻɺ
లػցश (BDT[39] DNN[40])ΛಋೖΔͱʹΑɺ৴ͱഎܠ
ΛशػցशʹΑ top LQ ͷߏΛߦΘΔͱՄʹͳΔɻ৴ΛΘ
ʹഎܠΛམͱͱՄͰɺ৴ײͷվળظΕΔɻɺΕܥޡͱͷ
ͶʹͳΓͲΒΑΓ৴ײ৻ॏʹਫ਼ͳΕͳΒͳɻ
ͷଞʹΦϒδΣΫτͷਖ਼ߏΛΔͱʹΑ৴ײѱҬΒൺత
ҬͷͱߏΔͱՄͰΔɻਤ 43ͰΑʹࡍʹ 2ͷϨϓ
τϯଘࡏΔͷʹɺ1ϨϓτϯνϟϯωϧͰߏΕΓɺ2ͷ τ Δͷʹ 1τ νϟϯω
ϧͰߏΕΔɻਖ਼ߏΔͱલड़ LQͷߏʹେΘ
ΔͱͰΔɻϨϓτϯߏʹഊΔݪҼͱ topߴӡಈΛΊʹϒʔετ
Ε b-jetͱϨϓτϯඇৗʹͳΔΊʹΦϒδΣΫτʹରΔ IsolationͷཁٻͰམͱΕΔ
ͱߟΒΕΔɻݱղੳͰطʹτϦΨʔΒΔ IsolationͷཁٻͷͳͰ؇WPΛબ
ΜͰΔɻɺ2ϨϓτϯҎͷνϟϯωϧͰยͷϨϓτϯͷ IsolationͷཁٻΛߋʹ؇
ΊΔͱͰײҬͱͷߏՄʹͳΔɻɺഎܠΔՄΔ
Ί৴ײʹॏΛஔదԽΔͱඞཁʹͳΔɻҰɺਖ਼ߏΔͱΑΓ
ͷϋυϩϯյΔ τ ͰΔɻݪҼ τ ͷ IDΑΓલͷߏʹΔɻ3ষͰड़
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
![Page 49: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/49.jpg)
ୈ 7ষ ͱΊͱల 48
Αʹ τ ͷಛͰΔ 1-prong 3-prongͷཁٻΛߏͷஈ֊ͰߦɻɺͷཁٻʹΑ
τ ͷߏམΔɻಛʹߏ truth 3-prong ͷߏΑͼ 2-prong ͱ
ΕΔΛਤߏ 71ʹɻΒʹߴӡಈʹͳΔͱߏམɺ2-prongͱ
ӡಈͷߴΕΔɻຊղੳͰߏ τ ΔҬಛʹ৴ײҬͰΔΊɺ
ͷߏͷ৴ײʹӨڹΛ༩ΔɻݪҼͱɺյલͷ τ ΑΓߴ
ӡಈΛͱʹΑϒʔετΕτϥοΫͷڑΔͱڍΒΕΔɻτ ͷ
ΒΕΔɻ1ϒʔετΕτߟʹΑΔඇΛվળΔΊʹɺ2ͷߏ
ϥοΫͷߏͷͰΔɻΧϩϦϝʔλͷใͱτϥοΫͷใΛͼΕτϥοΫ
ͷ pT ͱΧϩϦϝʔλʹམͱΤωϧΪʔͷҧʹΑΓݪཧతʹ 1τϥοΫΛ 2τϥοΫͱ
ΔΊߋΛมߏΔͱͰΔɻɺτϥοΫใͰΓߏ τ IDͷ
νϡʔχϯά TESͷܭɺIDʹରΔܥޡͷݟΓͳͲΛΓඞཁΔɻ
2-prong τ ΛղੳʹՃΔߟΒΕΔɻͷΊʹʹ 2-prong τ IDͷඞཁʹͳ
Δɻɺ2-prong τ ՙใͳͱ༧ଌΕΔɻͷΊɺղੳͷઃܭඞཁͱ
ͳΔɻͲΒͷΔେͳվળظΕΔͷͰΔɻ
ਤ 71 truth 3-prong τ ͷߏͱ 2-prong
ͱߏΕΔ
600 800 1000120014001600 1800200022002400effM
0
02
04
06
08
1
Trig
ger E
ffici
ency
Single lepton
HLT_ht1000
ਤ 72 Meff (GeV)ʹରΔγϯάϧϨ
ϓτϯͱ HT τϦΨʔͷऔಘ
ɺݱঢ়ͷղੳͰɺγϯάϧϨϓτϯτϦΨʔͷΈΛ༻ɺಛʹ 1Ϩϓτϯνϟϯω
ϧͰMeff େҬͰτϦΨʔͷऔಘ 100ͱͳΒͳɻͷղࡦͱɺHT
τϦΨʔڍΒΕΔɻͷτϦΨʔɺonline ϨϕϧͰߏΕ pT 50GeV Ҏͷ jet
ͷεΧϥʔܭτϦΨʔͷʹͳΔͷͰΔɻγϯάϧϨϓτϯτϦΨʔͱHT τϦ
ΨʔͷऔಘΛԣMeff ͰൺͷΛਤ 72ʹɻϨϓτϯτϦΨʔطʹ offlineϨ
ϕϧͰϨϓτϯʹର pT gt 30GeV ΛཁٻΔͷͰ 85ఔͰ flatͳʹͳΔɻ
ҰɺHT τϦΨʔMeff େҬͰ 100ͷ৴ͱͳΔɻHT τϦΨʔղੳʹՃ
ΔͱͰɺ৴ײͷҬͰϨϓτϯτϦΨʔʹΑ 15ΘΕ৴Λճ෮
ΔͱͰΔɻ
ͷվળͷՄΛड़ࡍʹͲΛվળΔͱຊղੳʹͷઌ
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
![Page 50: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/50.jpg)
ୈ 7ষ ͱΊͱల 49
ॱҐΛਐΊͱॏཁͰΔɻ
723 ͷଞͷੜաఔΛ༻ LQ୳ࡧ
ຊڀݚʹΑΔײධՁʹΑɺBΞϊϚϦʔΒ༧ΕΔ 1TeVҎԼͷҬͰຊղੳͰ
ͷݟਫ਼ଌఆɺະʹݟɺޙࠓͰΔͱΘɻغݟ LQΑΓॏ
ΛҬʹ୳ࡧΛߦͱॏཁʹͳΔɻਫ਼ଌఆΑͼॏ LQ୳ࡧͰॏཁʹͳΔ
ͷϞσϧʹґଘΔ LQ ୯ҰੜաఔΑͼ Drell-Yan աఔͰΔɻΕΕͷੜաఔΛਤ
73ͱਤ 74ʹɻੜաఔΕΕɺλ2ql ͱ λ4ql ʹൺΔΊ λql େͱੜஅ໘
େͳΔ [41]ɻ
r
ਤ 73 LQ୯Ұੜաఔ ਤ 74 LQ Drell-Yanੜաఔ
ਤ 75 LQରੜͱ୯Ұੜաఔͷஅ໘ͳΔ λql ͱMLQ[42]
ɺLHCʹΔ LQੜաఔͰରੜաఔ 1TeVҎԼͰࢧతͰΔॏͳΔʹ
ɺLHCͷॏܥΤωϧΪʔͰ 2ͷ LQΛੜͰΔஅ໘ݮʹٸΔΊʹͷଞ
ͷੜஅ໘ͷେͳΔɻਤ 75 ʹ LQ ରੜͱ୯Ұੜաఔͷஅ໘ͳΔ
λql ͱMLQ ͷΛɻཅࢠͷύʔτϯ (PDFParton Distribution Function) Ͱཅ
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
R U U
U
U
U
L
L
U
U
L
U
R L L
L
U L
L LL U
U U
![Page 51: . æ LHC-ATLAS î g t S Z Ä ¿ Ó « ¥ « q » ¢ è Ó Ä ï t H u …...2018 − {$ {$ $] $ ...](https://reader031.documents.pub/reader031/viewer/2022021917/5e5cb311c000610a6d5d46f7/html5/thumbnails/51.jpg)
ୈ 7ষ ͱΊͱల 50
தͷΫΥʔΫͷҟͳΔΊʹʹΑ୯Ұੜաఔͷஅ໘େҟͳΔɻͷࢠ
ʹΔ λql ͱMLQͷΕΕͷ LQ୳ࡧʹɺରੜաఔΑΓ୯Ұੜաఔͷ
৴ଟͳΔڥքͰΔɻಛʹ λ33 େҬཅࢠதͷϘτϜΫΥʔΫͷ
খΊൺత୯ҰੜաఔͱΘΔɻɺ λ33 1Ҏͷʹຊղ
ੳͷغΕҬΒੜஅ໘େͳΓΔͱΘΔɻ
51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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51
ॏͳو CERN ͰͷػڀݚձΛ༩ԼߒدฏڭतʹײΛਃɻLHC-
ATLASݧͱେͳݧάϧʔϓʹͰΔڥΛ༩ɻ
ɺૉࢠཧڀݚͷ໘നɺݧͷʑଟͷͱΛڭΘΓɻ
ຖिͷϛʔςΟϯάͰେมʹͳͷ KEKͷ૯ࢣߨɺICEPPͷߐೋॿڭɺ
ຊڀݚॿखͷ୩ࢯࢤوʹ෦ΒΜͷΞυόΠεΛɻɺICEPP
ͷԞଜګڭतʹࡍʹ ATLASͷ LQͷάϧʔϓͰɺ৭ʑͳ໘ͰαϙʔτΒ
ɻͷʑͷͰڀݚΛߦΕɻײΛਃɻ
CERNͷੜʹɺຊڀݚͷӬਅԝڀݚһɺՃढ़ӯࢯɺւࢯʹେม
ʹͳΓɻॳւੜͰΘΒͳͱଟʹݱੜͷϊϋΛڭ
ɻɺಉظͷԞଜਓࢯͱଟͷΛաमͷڀݚੜΛૹΔͱ
ͰɻຊʹΓͱɻ
ಉڀݚͷ ANKOKݧΛߦΔଜᚸਓࢯଔۀੜͷوݟੜࢯ ݱ) KEKڀݚһ)ʹ
ଟͷͱΛڭΘΓɺଟͷͱΛɺΑΓཧΛʹͳΔͰɻ
தխڭतʹɺڀݚΛਐΊͰʹΓͳͷΛଟײڭ
ɻᥩೋটᡈڀݚһʹɺڀݚҎͷͱଟ૬ஊɻൿॻͷࡔຊ
ರࢯࢠʹɺग़ுखଓʑͰڀݚʹதͰΔڥΛɻΓͱ
ɻ
ΛաͱͰɻ2ΓͱੜੜڀݚͷϝϯόʔͷͰڀݚ
ɻ
52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
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U
U
U
L
L
U
U
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L
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52
ݙจߟ
[1] Heavy Flavor Averaging Group httpshflavwebcernch
[2] LHCb Collaboration PHYSICAL REVIEW LETTERS 120121801 (2018)
[3] Particle Data Group httppdglblgov
[4] LHCb Collaboration Test of Lepton Universality Using B+ rarr K+l+lminus Decays
PHYSICAL REVIEW LETTERS 113 151601 (2014)
[5] LHCb Collaboration Test of lepton universality with B0 rarr Klowast0l+lminus decays
JHEP08(2017)055
[6] LHCb Collaboration Angular analysis and differential branching fraction of the decay
B0s rarr φmicro+microminus JHEP09(2015)179
[7] LHCb Collaboration Differential branching fraction and angular analysis of Λ0b rarr Λmicro+microminus
decays JHEP06(2015)115
[8] LHCb Collaboration Angular analysis of the B0 rarr Klowast0micro+microminus decay using 3fbʵ 1 of
integrated luminosity JHEP02(2016)104
[9] I Dorsner et al Physics of leptoquarks in precision experiments and at particle colliders
Physics Reports Volume 641 17 June 2016
[10] Dario Buttazzo et al B-physics anomalies a guide to combined explanations
JHEP11(2017)044
[11] Damir Becirevic et al Scalar leptoquarks from GUT to accommodate the B-physics
anomalies
[12] Tanumoy Mandal et al R(D(lowast)) in minimal leptoquark scenarios impact of interference
on the exclusion limits from LHC data arXiv181103561
[13] ATLAS Collaboration Search for supersymmetry in events with b-tagged jets and miss-
ing transverse momentum in pp collisions atradics = 13 TeV with the ATLAS detector
JHEP06(2018)108
[14] ATLAS Collaboration Search for top-squark pair production in final states with one
lepton jets and missing transverse momentum using 36 fbʵ 1 ofradics = 13TeV pp collision
data with the ATLAS detector JHEP06(2018)108
[15] Darius Alexander Faroughy Direct searches motivated by recent B-anomalies
ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
L
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ݙจߟ 53
arXiv181107582
[16] CMS Collaboration Search for third-generation scalar leptoquarks decaying to a top
quark and a τ lepton atradics = 13 TeV Eur Phys J C (2018)
[17] CERN Accelerating science httpshomecern
[18] Lyndon Evans and Philip Bryant LHC Machine JINST 3S08001 2008
[19] G Aad et al The ATLAS Experiment at the CERN Large Hadron Collider JINST
3S08003 2008
[20] H Pernegger The Pixel Detector of the ATLAS experiment for LHC Run-2 JINST
10C06012 2015
[21] A Ruiz Martinez The Run-2 ATLAS Trigger System Journal of Physics Conference
Series 762 (2016) 012003
[22] ATLAS Collaboration LuminosityPublicResultsRun2
httpstwikicernchtwikibinviewAtlasPublicLuminosityPublicResultsRun2
[23] ATLAS Collaboration Electron reconstruction and identification efficiency measure-
ments with the ATLAS detector using the 2011 LHC proton-proton collision data
EurPhysJC74(2014) 2941
[24] ATLAS Collaboration Muon reconstruction performance of the ATLAS detector in
proton-proton collision data atradics = 13 TeV EurPhysJC76(2016) 292
[25] M Cacciari G P Salam and G SoyezThe anti-kt jet clustering algorithm JHEP04(2008)
063
[26] ATLAS Collaboration Tagging and suppression of pileup jets with the ATLAS detector
ATLAS-CONF-2014-018
[27] ATLAS Collaboration Performance of b-Jet Identification in the ATLAS Experiment
JINST11(2016)P04008
[28] ATLAS Collaboration Topological cell clustering in the ATLAS calorimeters and its
performance in LHC Run 1 Eur Phys J C
[29] ATLAS Collaboration Reconstruction Energy Calibration and Identification of Hadron-
ically Decaying Tau Leptons in the ATLAS Experiment for Run-2 of the LHC
[30] ATLAS TDAQ Group Lowest un-prescaled triggers per data-taking period
httpstwikicernchtwikibinviewauthAtlasLowestUnprescaled
[31] JAlwall et al The automated computation of tree-level and next-to-leading order differ-
ential cross sections and their matching to parton shower simulations JHEP07(2014)079
[32] TMandal et al Pair production of scalar leptoquarks at the LHC to NLO parton shower
accuracy PhysRevD93 (2016)035018
[33] The NNPDF collaboration Parton distributions for the LHC run II JHEP04(2015)040
[34] TSjostrand et al An introduction to PYTHIA 82 Comput Phys Commun191(2015)
159
ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
U
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ݙจߟ 54
[35] PArtoisenet et al Automatic spin-entangled decays of heavy resonances in Monte Carlo
simulations JHEP03(2013)015
[36] Robert D Cousins et al Evaluation of three methods for calculating statistical signif-
icance when incorporating a systematic uncertainty into a test of the background-only
hypothesis for a Poisson processNuclear Instruments and Methods in Physics Research
A 595 (2008) 480ndash501
[37] GCowan et al Asymptotic formulae for likelihood-based tests of new physics
EurPhysJC 71(2011)1554
[38] Belle II Collaboration The Belle II Physics Book arXiv180810567
[39] ROOT team of CERN TMVA homepagehttptmvasourceforgenet
[40] Alex K etal ImageNet Classi cation with Deep Convolutional Neural Networks NIPS
2012 3 December 2012
[41] Martin Schmaltz The Leptoquark Hunterrsquos Guide Large Coupling arXiv181010017
[42] Ilja Dorsner etal Leptoquark toolbox for precision collider studies JHEP05(2018)126
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