OUTLINE
• Introduction
• CERNandtheLHC
• ATLASdetector
• StandardModel
• Dibosonresonances
• Physicsobjectdefinitions
• Searchstrategy
• DataandMC
• Eventreconstruction
• Pre-selection
• Regiondefinitions
• Higgs,𝑋,and𝑊′ reconstruction
• Multijet modeling
• Significance
• Conclusion
2
CERN ANDTHELHC
• EuropeanCenterforNuclearResearch(CERN)
• LocatednearGeneva,Switzerland
• SiteoftheLargeHadronCollider
• LargeHadronCollider(LHC)
• Currentlylargestparticleacceleratorintheworld
• Acceleratesprotonbunchestonearlyspeedoflight
• Fourmaincollisionsites:ATLAS,CMS,ALICE,andLHCb
• Operatesat 𝑠� = 13TeV asof2015
3
ATLASDETECTOR
• Cylindricalgeometry
• Innerdetector( 𝜂 < 2.5)• Usestrackingtomeasurechargeandmomentumofparticles as
theypassthrough2T axialmagneticfield
• Electromagnetic(EM)andhadroniccalorimeters• Tilehadroniccalorimter ( 𝜂 < 1.7)
• LiquidArgon(LAr)calorimeter( 𝜂 < 4.9)• Fourparts- EMbarrel,EMendcap,hadronicendcap,forward
calorimeters
• Muonspectrometer• Measureschargeandmomentumofmuonsastheypassthrough
atoroidalmagneticfield
4
STANDARDMODEL
• Formulatedin1970stodescribeelementaryparticlesandtheforcesmediatingtheinteractionsbetweenthem
• Particlessplitintofermionsandbosons
• Fermions- half-integerspin,includethequarksandtheleptons
• Bosons- integerspin,includethegaugebosonsandthescalarboson
5
DIBOSONRESONANCES
• Predictedbymanybeyond-the-Standard-Model(BSM)theories
• Currentlynoevidencefoundtovalidateexistence,despitemultiplededicatedsearchesusingtheLHC
• Currentanalysisfocuseson𝑊( → 𝑋ℎ resonantstate
• 𝑋 anewparticle,ℎ aHiggsboson
• Assumesallhadronicdecays:𝑊( → 𝑋ℎ → 𝑞𝑞'(𝑏𝑏'
6
PHYSICSOBJECTDEFINITIONS
• Hadronicjetsreconstructedusinganti-𝑘< algorithm• Large-𝑅 jetsreconstructedfromtopologicalcalorimeterclusterswithradiusparameter
𝑅 = 1.0• Trackjetsreconstructedfrominnerdetectortrackswithradiusparameter𝑅 = 0.2
• Associatedtolarge-𝑅 jetsusingghost-association
• Large-𝑅 jetstaggedwithtwo-prongstructureusingselectionon𝐷@(BCD)
• Variabletrainingontrue𝑊/𝑍 bosontodefineefficiencyworkingpoints
• 50%workingpointsusedhere
• Trackjets𝑏-taggedusingMV2c10• Multivariatediscriminantusingdisplacedverticestoidentifyheavy-flavorjets
• Variabletrainingon𝑡𝑡̅ eventstodefineefficiencyworkingpoints
• 77%workingpointusedhere
• Eventswithatleastoneleptonremovedfromconsideration7
SEARCHSTRATEGY
• High𝑊′mass⟹ assume𝑋 andHiggshaveconsiderablekineticenergyandsohigh𝑝L• Impliesthat𝑋 → 𝑞𝑞'′ andℎ → 𝑏𝑏' decayshavesmallopeningangle,i.e.aboosted/mergeddecaytopology
• Higgsand𝑋 reconstructedfromsinglelarge-𝑅 jetsandidentifiedusingthelarge-𝑅 jetmassandtrackjet𝑏-tagging,alongwiththetwo-prongedsubstructureselection
• Definetwonon-orthogonalsignalregionswithdifferentHiggsmasswindowsandcompareresultantsignalsensitivity
8
DATAANDMC
• Data• CollectedbyATLASdetectorat 𝑠� = 13TeV during2015and2016𝑝𝑝 collisions• Totalintegratedluminosityof36fbPD
• Signal(MadGraph5_aMC@NLO+Pythia8.186)• UseXHsamplesscaledto1pb crosssection• 100samplesused,𝑊′massbetween1000GeVand4000GeV,𝑋 massbetween65GeVand900GeV
• Background• MajorsourceexpectedtobeQCDmultijet,modeledhereusingdata-drivenestimate
• Minorbackgroundsmodeledwithsimulation• 𝑡𝑡̅ (Powheg-Box+Pythia6.428)
• 𝑉 + jets (Sherpa2.1)
9
EVENTSELECTION
Pre-selection• Beforeanalysis
• Allhadronicrequirementenforced
• Large-𝑅 jetswith𝑝L < 200GeV notconsideredforanalysis
• Eventswithfewerthan2large-𝑅 jetsnotconsidered
• Eventsmusthaveatleastonelarge-𝑅 jetwith𝑝L > 450GeV
• Beginningofanalysis
• Large-𝑅 jetswith𝑝L < 250GeV, 𝜂 < 2.0,or𝑚 < 50GeV discarded
• Eventswithfewerthan2remaininglarge-𝑅 jetsdroppedfromconsiderationintheanalysis
• Onlyleading2large-𝑅 jetskept
• High𝑊′massimpliesboostedHiggsand𝑋
• Anyotherlarge-𝑅 jetexpectedfrompile-up
• Onelarge-𝑅 jetmusthaveatleasttwoassociatedtrackjetswith𝑝L > 20GeV and𝜂 < 2.5,andleadingtwoarekept
• Higgsdijet decay
• Remark:ifbothhavetwosuchtrackjets,leadingtwokeptforboth
10
EVENTSELECTIONSignalRegion(SR\)forgivenmassthreshold𝑀• Atleastonelarge-𝑅 jetwith𝑀GeV < 𝑚 < 145GeV andtwotrackjets
• Otherlarge-𝑅 jetpassesthe𝐷@(BCD) substructureselection
HighSideBand(HSB\)forgivenmassthreshold𝑀• MustfailSR\requirements
• Atleastonelarge-𝑅 jetwith145GeV < 𝑚 < 200GeV andtwotrackjets• Upperboundchosentoavoidkinematicdifferencesathighmass
• Otherlarge-𝑅 jetpassesthesubstructureselection
𝑀 = 75GeV and𝑀 = 95GeV examined11
EVENTRECONSTRUCTION
Higgs,𝑋,and𝑊′ reconstruction• Higgsdefinedasthetwo-track-jetlarge-𝑅 jetintherelevantmasswindowwithotherjetpassingthe
substructureselection
• Ambiguity• Ifbothlarge-𝑅 jetssatisfytherequirements,onewithmore𝑏-tagschosenasHiggs
• Ifambiguitycontinuesandbothhavezero𝑏-tags,large-𝑅 jetwithmoretrackjetschosenasHiggs
• Ifambiguitycontinuesorbothhaveatleastone𝑏-tag,leadinglarge-𝑅 jetischosenasHiggs
• 𝑋 definedaslarge-𝑅 jetthatisnottheHiggs
• 𝑊( definedasthe4-vectorsumoftheHiggsjetandthe𝑋 jet
12
EVENTRECONSTRUCTION
Splittingregionsby𝑏-tag• SR\ andHSB\ splitbynumberofHiggs𝑏-tags
• ChannelsreferredtoasSR\` orHSB\` ,where𝑀 isthemassthresholdand𝑖 isthenumberof𝑏-tags
13
EVENTRECONSTRUCTION
Data-drivenmultijet estimation• Modeledbyre-weightofdataminussimulatedbackground(multijet dataorData– Vjets - 𝑡𝑡̅)inthe0-
tagchanneltoreproducethe1- and2-tagchannels
14
EVENTRECONSTRUCTION
Data-drivenmultijet estimation• Expectedthatdifferencesinchannelscomefromkinematicchangesarisingfrom𝑏-tagging,whichhas
efficiencydependentupon𝑝L and𝜂
15
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
210
310
410
510
610
710
810 095
, HSBtData - Vjets - t
)095
(norm. to HSB
295
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th sub-leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
0 95/H
SB2 95
HSB
0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
210
310
410
510
610
710
810095
, HSBtData - Vjets - t
)095
(norm. to HSB
295
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
0 95/H
SB2 95
HSB
0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
10
210
310
410
510
610
710
810
910095
, HSBtData - Vjets - t
)095
(norm. to HSB
195
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th sub-leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
0 95/H
SB1 95
HSB
0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
10
210
310
410
510
610
710
810
910
095
, HSBtData - Vjets - t
)095
(norm. to HSB
195
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
0 95/H
SB1 95
HSB
0.50.60.70.80.9
11.11.21.31.41.5
EVENTRECONSTRUCTION
Data-drivenmultijet estimation• WeightsderivedfromHiggsleadingandsub-leadingtrackjet𝑝L distributionsinHSBbc,withfirst
iterationweightsdefinedastheproductoftheratiosHSBbc` HSBbcde intheappropriatebinsoftheleadingandsubleadingdistributions
• Remark1:beforetheratioistaken,theHSBbc` isscaledtotheHSBbcd tokeeptheweightsontheorderofone
• Remark2:𝑝L distributionsarere-binnedtohavepositivebincontentandbinerrornogreaterthan30%
• SeconditerationperformedusingratiosoftheHSBbc` andtheappropriatere-weightoftheHSBbcd
• Finalweightdefinedasproductoffirstandseconditerationweights
16
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
210
310
410
510
610
710
810 (RW)095
, HSBtData - Vjets - t
(RW))095
(norm. to HSB
295
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th sub-leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
(RW
)0 95
/HSB
2 95H
SB 0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
210
310
410
510
610
710
810(RW)0
95, HSBtData - Vjets - t
(RW))095
(norm. to HSB
295
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
(RW
)0 95
/HSB
2 95H
SB 0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
10
210
310
410
510
610
710
810
910(RW)0
95, HSBtData - Vjets - t
(RW))095
(norm. to HSB
195
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th sub-leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
(RW
)0 95
/HSB
1 95H
SB 0.50.60.70.80.9
11.11.21.31.41.5
0 500 1000 1500 2000 2500
Eve
nts
/ 50.
0 G
eV
10
210
310
410
510
610
710
810
910
(RW)095
, HSBtData - Vjets - t
(RW))095
(norm. to HSB
195
, HSBtData - Vjets - t
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Th leading track jet p
[GeV]T
p0 500 1000 1500 2000 2500
(RW
)0 95
/HSB
1 95H
SB 0.50.60.70.80.9
11.11.21.31.41.5
17
RE-WEIGHTEDDISTRIBUTIONS
EVENTRECONSTRUCTION
Data-drivenmultijet estimation• Onceweightsderived,themultijet backgroundinagivenregionand𝑏-tagchannelisdefinedasthe
appropriatere-weightofthe0-tagchannelofthatregion,scaledtothenumberofeventsinthegivenchanneloftheregion
18
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Eve
nts
/ 100
.0 G
eV
1−101
10
210
310
410
510
610
710
810
910Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs175HSB
Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Eve
nts
/ 100
.0 G
eV
1−10
1
10
210
310
410
510
610
710 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs275HSB
Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Eve
nts
/ 100
.0 G
eV
1−101
10
210
310
410
510
610
710
810
910 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs195HSB
Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Eve
nts
/ 100
.0 G
eV
1−10
1
10
210
310
410
510
610
710 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs295HSB
Xh mass [GeV]0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 100 200 300 400 500 600 700 800 900 1000
Eve
nts
/ 20.
0 G
eV
1−101
10
210
310
410
510
610
710
810
910Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs175HSB
X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 100 200 300 400 500 600 700 800 900 1000
Eve
nts
/ 20.
0 G
eV
3−10
2−10
1−101
10
210
310
410
510
610
710
810 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs275HSB
X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 100 200 300 400 500 600 700 800 900 1000
Eve
nts
/ 20.
0 G
eV
1−101
10
210
310
410
510
610
710
810
910Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs195HSB
X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 100 200 300 400 500 600 700 800 900 1000
Eve
nts
/ 20.
0 G
eV
3−10
2−10
1−101
10
210
310
410
510
610
710
810 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs295HSB
X mass [GeV]0 100 200 300 400 500 600 700 800 900 1000
Dat
a/Bk
g
0.40.60.8
11.21.41.6
19
SIGNALSIGNIFICANCE
Definitions• Significanceofagivensignalinagivenregiondefinedasthe
signaltobackgroundratiointheregion
• Differenceinsignificanceoftworegionsforasignaldefinedasthepercentdifferenceofthesignificances
20
SIGNALSIGNIFICANCE
Calculatingsignificancein𝑚f and𝑚fg windows• Foreachsample,masswindowschosenabouttheappropriate𝑋 and𝑊′masses
• 𝑚f windowdefinitionforgivensample• 𝑚f distributionincombinedSRbcD + SRbc@ channelfittedtoGaussian
• Fitrangerestrictedtostartat0.7𝑀f (where𝑀f isthetruth𝑋 mass)andtoendat1TeV
• Meanrestrictedtovaryinrange(0.8𝑀f, 1.2𝑀f)
• Windowdefinedasintervalcenteredaboutthefittedmeanwithhalf-widthequalto1.5timesthefittedstandarddeviation
• 𝑚fg windowforgivensamplecalculatedsimilarlywith𝑚fg distributionincombined SRbcD + SRbc@ channelrestrictedtothealreadycalculated𝑚f window
• SeparatewindowscalculatedusingthecombinedSRjcD + SRjc@ channeltoavoidbias21
FITTEDDISTRIBUTIONSINSR95
Constant 50.7± 4132
Mean 0.1± 112.6
Sigma 0.083± 9.559
[GeV]Xm0 100 200 300 400 500 600 700
Even
ts
1000
2000
3000
4000
5000
6000
7000 ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Constant 26.3± 2036
Mean 1.0± 1767
Sigma 0.63± 73.49
[GeV]W’m500 1000 1500 2000 2500 3000 3500
Even
ts
500
1000
1500
2000
2500
3000
3500 ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Constant 23.7± 1581
Mean 0.3± 393.3
Sigma 0.25± 23.15
[GeV]Xm0 100 200 300 400 500 600 700 800 900
Even
ts
500
1000
1500
2000
2500
3000ATLAS Work in progress
-1 L dt = 36.1 fb∫ = 13 TeVs
Constant 11.7± 729
Mean 1.8± 2925
Sigma 1.1± 102.6
[GeV]W’m1500 2000 2500 3000 3500
Even
ts
200
400
600
800
1000
1200
1400ATLAS Work in progress
-1 L dt = 36.1 fb∫ = 13 TeVs
𝑚f = 110GeV,𝑚fg = 1800GeV 𝑚f = 400GeV,𝑚fg = 3000GeV
22
FITTEDDISTRIBUTIONSINSR75
𝑚f = 110GeV,𝑚fg = 1800GeV 𝑚f = 400GeV,𝑚fg = 3000GeV
Constant 54.6± 4743
Mean 0.1± 112.6
Sigma 0.077± 9.489
[GeV]Xm0 100 200 300 400 500 600 700
Even
ts
1000
2000
3000
4000
5000
6000
7000
8000ATLAS Work in progress
-1 L dt = 36.1 fb∫ = 13 TeVs
Constant 26.5± 2046
Mean 1.1± 1760
Sigma 0.7± 77
[GeV]W’m500 1000 1500 2000 2500 3000 3500
Even
ts
500
1000
1500
2000
2500
3000
3500
4000
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Constant 25.2± 1782
Mean 0.3± 393.4
Sigma 0.24± 23.19
[GeV]Xm0 100 200 300 400 500 600 700 800 900
Even
ts
500
1000
1500
2000
2500
3000
3500
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs
Constant 11.9± 751.1
Mean 1.8± 2919
Sigma 1.1± 105
[GeV]W’m1500 2000 2500 3000 3500
Even
ts
200
400
600
800
1000
1200
1400ATLAS Work in progress
-1 L dt = 36.1 fb∫ = 13 TeVs
23
SIGNALSIGNIFICANCE
Calculatingsignificancein𝑚f and𝑚fg windows• Oncewindowscalculatedforeachsampleandsignalregion,significancecalculatedasratioofsignalto
backgroundinthesignalregionrestrictedtothewindows
24
SIGNIFICANCEINSR95 WINDOWS
1 95 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1−10
1
10
210
1.1e-01 8.1e-02 6.3e-02 5.4e-02
3.1e-01 2.2e-01 1.8e-01 1.3e-01 1.1e-01 1.2e-01
8.8e-01 5.9e-01 5.0e-01 3.5e-01 3.3e-01 4.4e-01 5.4e-01
2.1e+00 1.4e+00 1.3e+00 9.0e-01 1.1e+00 1.5e+00 2.4e+00
3.6e+00 2.6e+00 2.3e+00 1.6e+00 1.7e+00 1.9e+00 2.7e+00 5.1e+00 1.4e+00
7.1e+00 4.6e+00 4.6e+00 3.4e+00 3.6e+00 4.1e+00 5.6e+00 1.2e+01 2.1e+01
1.4e+01 9.7e+00 8.6e+00 6.1e+00 5.9e+00 7.1e+00 9.9e+00 2.1e+01 3.8e+01 5.2e+01
2.5e+01 1.9e+01 1.8e+01 1.2e+01 1.3e+01 1.6e+01 3.4e+01 6.8e+01 1.1e+02 1.3e+02
5.0e+01 4.3e+01 3.2e+01 2.2e+01 2.1e+01 2.5e+01 2.5e+01 5.0e+01 9.7e+01 1.4e+02 1.6e+02 2.5e+02
7.6e+01 7.8e+01 6.6e+01 4.6e+01 4.8e+01 4.3e+01 4.9e+01 8.2e+01 1.7e+02 3.6e+02 5.1e+02 6.4e+02 3.2e+02
1.1e+02 1.1e+02 1.0e+02 7.5e+01 6.5e+01 6.4e+01 6.6e+01 1.0e+02 1.8e+02 2.4e+02 6.5e+02 4.2e+02 8.0e+02
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
[GeV
]W
’m
1000
1200
1500
1800
2000
2300
2600
3000
3400
3800
4000
2 95 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1
10
210
310
1.7e+00 1.2e+00 9.2e-01 8.6e-01
4.2e+00 3.0e+00 2.4e+00 1.8e+00 1.7e+00 1.8e+00
1.1e+01 7.4e+00 6.3e+00 4.6e+00 4.1e+00 5.4e+00 7.1e+00
2.1e+01 1.5e+01 1.4e+01 9.7e+00 1.2e+01 1.7e+01 2.6e+01
3.4e+01 2.5e+01 2.3e+01 1.5e+01 1.6e+01 1.9e+01 2.6e+01 5.0e+01 1.3e+01
5.7e+01 3.6e+01 3.7e+01 2.9e+01 3.0e+01 3.4e+01 4.7e+01 9.5e+01 1.8e+02
9.1e+01 6.5e+01 5.6e+01 4.4e+01 4.0e+01 5.1e+01 6.4e+01 1.4e+02 2.5e+02 4.2e+02
1.5e+02 1.1e+02 1.0e+02 6.4e+01 7.1e+01 9.0e+01 2.0e+02 3.7e+02 5.7e+02 5.8e+02
2.1e+02 2.1e+02 1.5e+02 1.1e+02 1.1e+02 1.2e+02 1.3e+02 2.3e+02 4.5e+02 6.0e+02 6.2e+02 9.0e+02
3.8e+02 3.4e+02 2.8e+02 2.1e+02 2.2e+02 1.8e+02 2.0e+02 3.4e+02 6.7e+02 1.0e+03 1.9e+03 2.1e+03 7.3e+02
4.5e+02 4.8e+02 4.4e+02 3.0e+02 2.9e+02 2.8e+02 2.9e+02 4.2e+02 6.9e+02 7.9e+02 1.9e+03 1.3e+03 1.7e+03
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
[GeV
]W
’m
1000
1200
1500
1800
2000
2300
2600
3000
3400
3800
4000
1 75 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1−10
1
10
210
8.0e-02 5.7e-02 4.5e-02 3.9e-02
2.3e-01 1.5e-01 1.2e-01 9.2e-02 8.1e-02 8.9e-02
6.4e-01 4.1e-01 3.5e-01 2.5e-01 2.4e-01 3.2e-01 3.9e-01
1.6e+00 9.8e-01 9.1e-01 6.5e-01 7.7e-01 1.1e+00 1.7e+00
2.7e+00 1.8e+00 1.6e+00 1.1e+00 1.2e+00 1.4e+00 2.0e+00 3.8e+00 1.1e+00
5.5e+00 3.2e+00 3.2e+00 2.5e+00 2.6e+00 3.0e+00 4.2e+00 9.2e+00 1.6e+01
1.0e+01 6.7e+00 6.0e+00 4.4e+00 4.3e+00 5.2e+00 7.5e+00 1.6e+01 2.8e+01 4.3e+01
2.0e+01 1.3e+01 1.3e+01 8.7e+00 9.6e+00 1.2e+01 2.6e+01 5.1e+01 8.5e+01 1.1e+02
3.8e+01 3.2e+01 2.4e+01 1.7e+01 1.6e+01 1.9e+01 2.0e+01 3.8e+01 7.8e+01 1.1e+02 1.3e+02 2.3e+02
6.2e+01 5.6e+01 4.7e+01 3.7e+01 3.6e+01 3.2e+01 3.8e+01 6.3e+01 1.1e+02 2.6e+02 3.9e+02 3.7e+02 2.8e+02
8.1e+01 7.9e+01 6.9e+01 5.8e+01 5.3e+01 5.1e+01 5.0e+01 8.5e+01 1.3e+02 1.9e+02 5.6e+02 6.3e+02 6.0e+02
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
[GeV
]W
’m
1000
1200
1500
1800
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2300
2600
3000
3400
3800
4000
2 75 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1
10
210
310
1.1e+00 7.7e-01 6.1e-01 5.6e-01
3.0e+00 2.0e+00 1.6e+00 1.2e+00 1.1e+00 1.2e+00
7.4e+00 4.8e+00 4.2e+00 3.1e+00 2.8e+00 3.7e+00 4.9e+00
1.5e+01 9.9e+00 9.2e+00 6.7e+00 8.1e+00 1.2e+01 1.8e+01
2.5e+01 1.7e+01 1.5e+01 1.0e+01 1.1e+01 1.4e+01 1.9e+01 3.7e+01 1.0e+01
4.2e+01 2.5e+01 2.5e+01 2.0e+01 2.0e+01 2.4e+01 3.4e+01 7.4e+01 1.4e+02
6.7e+01 4.3e+01 3.8e+01 3.0e+01 2.8e+01 3.3e+01 4.7e+01 1.1e+02 1.8e+02 3.3e+02
1.1e+02 7.4e+01 6.9e+01 4.7e+01 5.2e+01 6.6e+01 1.5e+02 2.8e+02 4.3e+02 5.0e+02
1.6e+02 1.5e+02 1.1e+02 8.1e+01 7.9e+01 9.2e+01 9.7e+01 1.8e+02 3.6e+02 4.7e+02 4.5e+02 8.0e+02
2.8e+02 2.3e+02 1.9e+02 1.6e+02 1.7e+02 1.3e+02 1.5e+02 2.6e+02 5.2e+02 7.9e+02 1.4e+03 1.2e+03 6.5e+02
2.9e+02 3.1e+02 2.8e+02 2.3e+02 2.3e+02 2.1e+02 2.1e+02 3.4e+02 5.1e+02 6.3e+02 1.7e+03 2.1e+03 1.3e+03
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
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SRbcD SRbc@ SRjcD SRjc@
25
SIGNIFICANCEINSR95 WINDOWS
SRbcD SRbc@ SRjcD SRjc@
1 95 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1−10
1
10
210
1.1e-01 7.6e-02 5.9e-02 5.1e-02
3.0e-01 2.0e-01 1.6e-01 1.2e-01 1.1e-01 1.2e-01
8.3e-01 5.5e-01 4.7e-01 3.3e-01 3.2e-01 4.2e-01 5.1e-01
2.0e+00 1.3e+00 1.3e+00 8.7e-01 1.0e+00 1.5e+00 2.3e+00
3.5e+00 2.5e+00 2.2e+00 1.5e+00 1.6e+00 1.9e+00 2.6e+00 4.9e+00 1.4e+00
6.9e+00 4.3e+00 4.4e+00 3.3e+00 3.5e+00 3.9e+00 5.4e+00 1.1e+01 1.9e+01
1.3e+01 9.2e+00 8.3e+00 5.8e+00 5.7e+00 6.9e+00 1.0e+01 2.0e+01 3.8e+01 5.0e+01
2.4e+01 1.8e+01 1.7e+01 1.1e+01 1.2e+01 1.5e+01 3.3e+01 6.5e+01 1.1e+02 1.2e+02
4.8e+01 3.9e+01 3.2e+01 2.2e+01 2.0e+01 2.3e+01 2.5e+01 4.8e+01 9.7e+01 1.3e+02 1.7e+02 2.6e+02
7.7e+01 7.3e+01 6.6e+01 4.3e+01 4.5e+01 4.1e+01 4.8e+01 7.8e+01 1.6e+02 3.2e+02 5.1e+02 6.3e+02 3.3e+02
1.1e+02 1.1e+02 9.9e+01 7.5e+01 6.2e+01 6.2e+01 6.4e+01 9.6e+01 1.8e+02 2.3e+02 6.5e+02 3.7e+02 8.1e+02
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
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]W
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2 95 w
indo
w in
SR
W’
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ifica
nce
of m
1
10
210
310
1.6e+00 1.1e+00 8.6e-01 8.1e-01
4.1e+00 2.9e+00 2.3e+00 1.7e+00 1.6e+00 1.7e+00
1.0e+01 7.0e+00 6.0e+00 4.3e+00 3.9e+00 5.1e+00 6.7e+00
2.0e+01 1.4e+01 1.3e+01 9.3e+00 1.1e+01 1.6e+01 2.4e+01
3.3e+01 2.4e+01 2.2e+01 1.4e+01 1.5e+01 1.8e+01 2.4e+01 4.8e+01 1.3e+01
5.5e+01 3.4e+01 3.6e+01 2.8e+01 2.9e+01 3.1e+01 4.4e+01 9.1e+01 1.7e+02
8.7e+01 6.2e+01 5.4e+01 4.2e+01 3.8e+01 5.0e+01 6.4e+01 1.4e+02 2.5e+02 4.0e+02
1.4e+02 1.0e+02 9.6e+01 6.1e+01 6.8e+01 8.6e+01 2.0e+02 3.6e+02 5.4e+02 5.5e+02
2.1e+02 2.0e+02 1.5e+02 1.1e+02 1.0e+02 1.1e+02 1.3e+02 2.3e+02 4.5e+02 5.6e+02 6.3e+02 9.1e+02
3.9e+02 3.3e+02 2.8e+02 1.9e+02 2.1e+02 1.7e+02 2.0e+02 3.2e+02 6.4e+02 9.4e+02 1.9e+03 2.1e+03 7.5e+02
4.3e+02 4.4e+02 4.2e+02 3.0e+02 2.8e+02 2.7e+02 2.8e+02 3.9e+02 6.9e+02 7.7e+02 1.9e+03 1.1e+03 1.7e+03
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
[GeV
]W
’m
1000
1200
1500
1800
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2300
2600
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3400
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4000
1 75 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1−10
1
10
210
7.6e-02 5.4e-02 4.3e-02 3.7e-02
2.2e-01 1.4e-01 1.2e-01 8.7e-02 7.7e-02 8.3e-02
6.1e-01 3.9e-01 3.3e-01 2.4e-01 2.3e-01 3.1e-01 3.7e-01
1.5e+00 9.4e-01 8.8e-01 6.3e-01 7.4e-01 1.1e+00 1.7e+00
2.6e+00 1.7e+00 1.5e+00 1.1e+00 1.1e+00 1.4e+00 1.9e+00 3.7e+00 1.1e+00
5.2e+00 3.1e+00 3.1e+00 2.4e+00 2.5e+00 2.9e+00 4.0e+00 8.9e+00 1.5e+01
9.9e+00 6.5e+00 5.8e+00 4.3e+00 4.1e+00 5.0e+00 7.5e+00 1.6e+01 2.8e+01 4.1e+01
1.9e+01 1.3e+01 1.2e+01 8.3e+00 9.3e+00 1.1e+01 2.5e+01 5.0e+01 8.1e+01 1.0e+02
3.7e+01 2.9e+01 2.4e+01 1.6e+01 1.5e+01 1.8e+01 1.9e+01 3.7e+01 7.0e+01 1.1e+02 1.3e+02 2.1e+02
6.3e+01 5.3e+01 4.7e+01 3.5e+01 3.5e+01 3.1e+01 3.8e+01 6.0e+01 1.1e+02 2.5e+02 3.9e+02 3.7e+02 2.9e+02
7.8e+01 7.6e+01 6.7e+01 5.8e+01 5.0e+01 5.0e+01 4.9e+01 7.9e+01 1.1e+02 1.7e+02 5.6e+02 4.5e+02 6.1e+02
[GeV]Xm65 110 130 160 200 250 300 400 500 600 700 800 900
[GeV
]W
’m
1000
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2 75 w
indo
w in
SR
W’
Sign
ifica
nce
of m
1
10
210
310
1.1e+00 7.3e-01 5.8e-01 5.3e-01
2.9e+00 1.9e+00 1.5e+00 1.1e+00 1.1e+00 1.1e+00
7.0e+00 4.6e+00 4.0e+00 2.9e+00 2.7e+00 3.5e+00 4.7e+00
1.4e+01 9.4e+00 8.7e+00 6.4e+00 7.7e+00 1.1e+01 1.7e+01
2.4e+01 1.6e+01 1.4e+01 9.7e+00 1.1e+01 1.3e+01 1.8e+01 3.5e+01 9.5e+00
4.0e+01 2.4e+01 2.4e+01 1.9e+01 1.9e+01 2.3e+01 3.1e+01 7.1e+01 1.3e+02
6.4e+01 4.2e+01 3.7e+01 2.9e+01 2.7e+01 3.3e+01 4.7e+01 1.1e+02 1.8e+02 3.2e+02
1.1e+02 7.1e+01 6.6e+01 4.5e+01 5.0e+01 6.3e+01 1.5e+02 2.7e+02 4.0e+02 4.9e+02
1.5e+02 1.5e+02 1.1e+02 7.8e+01 7.6e+01 8.6e+01 9.5e+01 1.8e+02 3.5e+02 4.5e+02 4.7e+02 7.6e+02
2.9e+02 2.2e+02 1.9e+02 1.5e+02 1.6e+02 1.2e+02 1.5e+02 2.4e+02 4.9e+02 7.4e+02 1.4e+03 1.2e+03 6.7e+02
2.9e+02 2.9e+02 2.8e+02 2.3e+02 2.2e+02 2.1e+02 2.0e+02 3.2e+02 5.2e+02 5.7e+02 1.7e+03 1.4e+03 1.4e+03
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26
SIGNALSIGNIFICANCE
Calculatingsignificancein𝑚f and𝑚fg windows• Oncethesignificanceiscalculatedforeachsignalregionineachwindow,thepercentdifference
betweenthesignificanceoftheSRbc andsignificanceoftheSRjc iscalculatedineachwindowforthesakeofcomparison
27
PERCENTDIFFERENCEINSR95 WINDOWS
win
dow
, b-ta
g =
1W
’Pe
rcen
t diff
eren
ce in
sig
nific
ance
at m
50−
40−
30−
20−
10−
0
10
20
30
40
29.9 29.2 28.4 28.2
25.4 30.4 30.1 28.3 28.1 28.5
26.7 30.3 29.9 28.5 28.2 27.8 28.4
26.6 30.5 30.8 28.3 27.2 26.5 26.7
25.2 30.0 30.8 28.7 28.6 27.0 25.9 24.6 23.8
23.5 29.2 30.2 28.4 28.4 27.0 25.2 22.7 21.5
24.4 30.5 29.6 26.9 27.4 27.4 25.0 22.4 26.8 18.3
18.1 28.1 28.4 26.3 24.7 25.5 23.7 24.8 24.1 14.8
23.8 24.5 24.6 25.7 23.6 22.1 22.2 23.2 19.5 16.7 21.4 9.0
18.2 28.2 29.3 19.1 23.2 25.7 22.4 22.7 35.6 26.1 22.9 41.9 12.0
28.9 29.6 33.1 22.7 18.5 19.9 24.2 17.9 28.8 21.2 14.2 -50.3 25.3
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win
dow
, b-ta
g =
2W
’Pe
rcen
t diff
eren
ce in
sig
nific
ance
at m
60−
40−
20−
0
20
40
34.9 35.1 33.2 34.5
29.5 35.2 34.3 32.5 32.9 33.5
31.0 34.6 33.9 32.3 31.8 30.6 31.1
28.6 33.9 34.5 31.2 30.5 28.8 29.5
27.5 33.3 34.5 33.1 31.7 30.0 27.7 26.0 24.7
26.0 31.0 32.2 30.9 31.6 29.2 27.8 22.5 22.8
26.5 32.9 31.7 30.6 29.9 34.5 26.0 23.4 27.3 22.1
21.9 30.6 31.6 27.0 26.8 26.9 24.8 25.2 24.5 15.1
26.0 27.1 26.7 26.2 26.4 25.1 24.7 24.1 20.5 20.8 26.9 11.7
25.1 32.0 30.7 22.5 25.0 27.3 23.4 23.4 22.5 22.6 27.2 43.5 11.1
34.8 34.9 35.2 24.4 19.1 23.3 27.2 19.3 27.0 21.1 9.0 -63.0 21.0
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28
PERCENTDIFFERENCEINSR75 WINDOWS
win
dow
, b-ta
g =
2W
’Pe
rcen
t diff
eren
ce in
sig
nific
ance
at m
20−
10−
0
10
20
30
40
34.6 34.7 32.8 33.9
29.4 34.8 33.7 32.2 32.6 33.0
30.6 34.2 33.7 32.2 31.7 30.4 30.7
28.1 33.5 35.2 31.3 30.4 28.6 28.6
27.8 33.3 34.8 32.8 31.5 29.7 27.9 28.0 24.3
26.2 31.0 32.2 31.0 32.2 28.4 28.0 22.3 21.8
26.8 32.3 31.8 30.1 29.4 34.2 26.0 22.9 27.3 21.6
22.3 31.3 31.4 27.1 26.7 27.4 24.5 24.7 25.2 11.8
25.7 27.6 27.4 27.5 26.1 24.6 24.6 23.5 21.2 19.4 25.5 16.8
25.1 31.6 30.4 21.3 23.5 27.0 21.9 23.7 23.1 21.0 27.2 43.4 10.4
33.9 33.0 34.3 25.0 20.2 23.2 26.2 18.6 24.3 25.8 8.9 -25.4 21.2
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]W
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win
dow
, b-ta
g =
1W
’Pe
rcen
t diff
eren
ce in
sig
nific
ance
at m
20−
10−
0
10
20
30
40
29.6 29.0 27.8 27.8
25.3 29.7 29.6 27.9 27.8 28.0
26.2 30.0 29.8 28.0 27.9 27.7 28.2
25.9 30.1 30.7 28.1 27.2 26.3 26.6
25.4 29.8 30.7 28.7 28.4 26.7 26.0 24.5 23.6
23.7 28.7 30.2 28.5 28.6 26.5 24.9 22.4 20.6
24.7 29.9 29.7 26.5 26.9 27.3 25.1 22.0 26.8 17.3
18.8 28.7 28.2 26.3 24.7 25.7 22.9 24.2 24.6 10.0
23.4 26.3 25.5 26.9 23.5 21.8 22.0 22.6 27.7 15.2 19.3 18.3
18.2 27.9 28.4 18.2 21.7 25.7 20.7 23.0 35.5 23.6 22.9 41.8 12.1
28.5 28.0 32.1 23.5 19.4 20.0 23.1 17.4 39.7 24.2 14.1 -22.1 25.3
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29
CONCLUSION
• TwosignalregionswithdifferentHiggsmasswindowscomparedwiththeaimofoptimizingsearchesfor𝑊 → 𝑋ℎ → 𝑞𝑞'(𝑏𝑏' decaysinthemergedchannel
• SignificanceofSRbc andSRjc judgedbyexaminingsignaltobackgroundratiosin𝑋 and𝑊′masswindowstailoredtoeachsignalsampleandsignalregion
• Inallsamplesbutthe𝑚f = 800GeV,𝑚fg = 4000GeV,theSRjc haslessersignificance,withatypicalpercentdifferenceofapproximately20%to30%
• ConcludethatthetighterHiggsmasswindowismoreoptimal
30
32
2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5
Eve
nts
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1
10
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510
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810Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs175HSB
ηh leading track jet 2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5
Dat
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1
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310
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ATLAS Work in progress-1 L dt = 36.1 fb∫
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ηh leading track jet 2.5− 2− 1.5− 1− 0.5− 0 0.5 1 1.5 2 2.5
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X D20 1 2 3 4 5 6 7 8 9 10
Dat
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810
910 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs275HSB
X D20 1 2 3 4 5 6 7 8 9 10
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 1 2 3 4 5 6 7 8 9 10
Eve
nts
/ 0.4
1−101
10
210
310
410
510
610
710
810
910
1010Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs195HSB
X D20 1 2 3 4 5 6 7 8 9 10
Dat
a/Bk
g
0.40.60.8
11.21.41.6
0 1 2 3 4 5 6 7 8 9 10
Eve
nts
/ 0.4
3−10
2−10
1−101
10
210
310
410
510
610
710
810
910 Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs295HSB
X D20 1 2 3 4 5 6 7 8 9 10
Dat
a/Bk
g
0.40.60.8
11.21.41.6
150 160 170 180 190 200
Eve
nts
/ 2.5
GeV
10
210
310
410
510
610
710Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs175HSB
h mass [GeV]150 160 170 180 190 200
Dat
a/Bk
g
0.40.60.8
11.21.41.6
150 160 170 180 190 200
Eve
nts
/ 2.5
GeV
1−10
1
10
210
310
410
510
610
710Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs275HSB
h mass [GeV]150 160 170 180 190 200
Dat
a/Bk
g
0.40.60.8
11.21.41.6
150 160 170 180 190 200
Eve
nts
/ 2.5
GeV
10
210
310
410
510
610
710Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs195HSB
h mass [GeV]150 160 170 180 190 200
Dat
a/Bk
g
0.40.60.8
11.21.41.6
150 160 170 180 190 200
Eve
nts
/ 2.5
GeV
1−10
1
10
210
310
410
510
610
710Z+jets W+jetstt MultijetData
ATLAS Work in progress-1 L dt = 36.1 fb∫
= 13 TeVs295HSB
h mass [GeV]150 160 170 180 190 200
Dat
a/Bk
g
0.40.60.8
11.21.41.6