Super B FactoriesSuper B Factories
Masashi Hazumi (KEK)
Some news about Super B Factories Available physics studies for Super B Factories Plan/proposals by SuperKEKB study group Questions for discussions
2
Belle/KEKB Luminosity Milestone: 500 fb-
1=0.5 ab-1
-
Current Total =546 fb-1
(Equivalent to > 500 million BB-pairs)
(as of Feb 6, 2006)
Expect many new results by summer 2006 !Expect many new results by summer 2006 !
Crab crossing: beginning of SuperB !Crab crossing: beginning of SuperB !
crossing angle 22 mrad
Head-on (crab)
◊
◊◊
◊◊
ξy
(Strong-weak simulation)
(Strong-strong simulation)
Crab crossing may increase the beam-beam parameter up to 0.19 !
Superconducting crab cavities are now being tested, will be
installed in KEKB around March 2006.
K. Ohmi
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SuperKEKB Luminosity ProjectionSuperKEKB Luminosity Projection• Crab cavity installation in
2006• ~2109 BB pairs by 2008
(4now)• Long shutdown
(14months) in 2009-2010• Constant improvement
from 2010– realistic and reliable plan
based on experiences at KEKB
– Crab cavities well tested before 2010: a big advantage !
We are here.We are here.
5
4
3
2
1N
BB
(10
10)
NBB ~100 now !in the LHC era
NBB ~100 now !in the LHC era
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A Linear SuperB Factory
Recent workshop: http://www.lnf.infn.it/conference/superbf05/ ; publication: physics/0512235
Promising new idea using synergy with ILC research
achieve L ~ 1036 cm–2s–1 through very small beam-spot size: (x,y) submicrons (ATF2-FF)
(yields luminosity enhancement of >103 compared to original SLAC-Super-B design)
achieve small transversal emittance in damping ring with short damping time (< 1.5ms)
4 b c
x y
DHN N n f
LBeam-beam “disruption” parameter
Several design alternatives under examination SBF layout with one damping ring and superconducting linacs
P. Raimondi, WS Hawaii 2005
5 GeV e
+ SC Linac
7 GeV e
+
4 GeV e
– SC Linac
4 GeV e –
e – gun
e – dump
2 GeV e
+ damping ring
IP
2 GeV e
+ injection
transport lines for energy return
2x3km or 6km
slide by A.Hoecker at CCSG symposium in Orsay, Jan.2006
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Available physics studiesAvailable physics studies
• SuperKEKB: hep-ex/0406071• SuperBaBar: hep-ph/0503261• Additional SuperKEKB studies at the last CERN Flavor WS
in Nov. 2005– Plenary talk “Future prospects for B factories” by M. Hazumi
– WG2 talk “Prospects for Measurements of b s, b sll and b c / at Super-B” by T. Iijima
– Cf. Many other talks from Belle/BaBar on present results
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Super B Physics ReachSuper B Physics Reach50ab-1
CK
Mw
/ F
CN
CC
PV
(b
s)
BB
l
l’
3l
l Ks
B
109 108 107 106 105
Upper limit on Br
w/ improvement simple projection
from SuperKEKB LoI
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Radiative DecaysRadiative Decays• Inclusive Br(bs) |C7|, SF for |Vub|
• BK* isospin asymmetry (+-) sign of C7
• Mixing induced CPV
• Direct CPV in BXs
• BXd
Summary by M.Nakao1st Super-B workshopat Hawaii
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KsKs
based onS.Khalil and E.Kou PRD67, 055009 (2003)and SuperKEKB LoI
K. Hara (KEK)M. Hazumi (KEK)
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CPV in b CPV in b s and SUSY breaking s and SUSY breaking
• Correlations are useful to differentiate new physics models• Correlations are useful to differentiate new physics models
Expected precision at 5ab
T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI
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More tests of SUSY breaking scenariosMore tests of SUSY breaking scenarios
S(K*)
S(Ks)
Br(b s)
A(b s)
AFB(b sll)
Br( )S(Ks)
50ab-1 A(b s)Br(b s)
AFB(b sll)
( )e
0
( )e223(13)l
(m )
l
SUSY GUT relation 2 3
R L
i(φ -φ )2 2d l23 23
m m e
Correlation to b sS0 implies lower bound on Br( )
T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI
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SUSY breaking at SuperKEKBSUSY breaking at SuperKEKB
Direct asymmetry in b s
TCPV in B KsTCPV in B K*
b s
g
b
ss
s s
23d
T.Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka (2002, 2004) + SuperKEKB LoI
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Parity of new physicsParity of new physics
LL or LRRL or RR
from slides byM. Endo at HL06 workshop, 2004M. Yamaguchi at ICFP2005
M. Endo, S. Mishima, M. YamaguchiPLB609, 95 (2005)
14
today
2008
Uncertain regions could be clarified by B-Factories• depends on all other SUSY parameters …
Approx…
2HDM
R.FacciniCharged HiggsCharged Higgs
15
How to distinguish the How to distinguish the or A or Att phase phase
from the from the dd2323 phase ? phase ?
P. Ko, SuperBaBar physics book (hep-ph/0503261) p.400 (p.410 in printed version)
16
Plan/proposals by SuperKEKB study groupPlan/proposals by SuperKEKB study group• Update SuperKEKB sensitivities
– This can be done locally.– Most likely after ICHEP2006 (can use present estimations for the time being)
• Combined plots with model calculations, discovery potentials– Observables: a set of b s observables, LFV, b c, – Benchmark models should include
• EWBGEN-motivated SUSY with sizable effects in B decays (e.g. effective SUSY)• SUSY GUT (to demonstrate correlations b/w b s and )• Model(s) that (can) accommodate observed CKM hierarchy: e.g. SUSY + flavor sym
metry• Models that (can) explain the number of generations ?: e.g. superstring-inspired ?• Extra dim. ?• Whatever else interesting
• Synergy study 1 with LHCb: e.g. b s observables from both exps.• Synergy study 2 with leptons (WG3): e.g. and e• Synergy study 3 with high pt (WG1)
– e.g. SUSY GUT, test of EWBGEN, narrowing down SUSY breaking scenarios, charged Higgs
• More studies if time/manpower allows
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Questions (for discussions)Questions (for discussions)• How to show discovery potential ?
– Some people want “energy/mass reach”, which is sometimes irrelevant for flavor physics (mass reach can be very high assuming a strong coupling)
• Are models proposed in the previous slide reasonable ?– If so, is it possible for the theory community to come up with a reasonable set of
benchmark models ?
• What do we use for QCD engineering, QCDF, pQCD, anything else ?– Need to choose something as a standard tool
• How can experimentalists access model calculations ? – SuperKEKB LoI: theorists provided a big table of outputs (observables as a function of
input parameters)
– Can we have “generators” that can be used by experimentalists ?• exp. gets more freedom
• th. may get more citations
– Better way ?
• Additional observables that were not covered previously ? – e.g. B K, B VV triple-product correlations NOT included in SuperKEKB LoI
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Backup SlidesBackup Slides
19
LL
LR
RR
RL
G.L.Kane, P.Ko, Haibin Wang, C.Kolda, Jae-hyeon Park, Lian-Tao Wang,PRD70, 035015 (2004)
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• Mass reach in general is much higher than O(TeV).
Caution !This fig. does nottake into accountSUSY breakdownat large mass.Should be used only forillustration purpose.
from Jae-hyeon Park
