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15/12/2008from LHC to the UniverseP. Chang 1 CP Violation and Rare R Decays CP Violation and Rare R Decays Paoti Chang Paoti Chang National Taiwan University From LHC to the Universe NTU, Taipei December 15, 2008
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15/12/2008from LHC to the UniverseP. Chang 2 KM Mechanism CP violation is due to a complex phase in quark mixing matrix CP violation is due to a complex phase in quark mixing matrix 1()1() 2()2() 3()3() V td V* tb V cd V* cb V ud V* ub Unitarity Matrix V ud V* ub + V cd V* cb + V td V* tb = 0
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15/12/2008from LHC to the UniverseP. Chang 3 Nobel Prize 2008
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15/12/2008from LHC to the UniverseP. Chang 4 Time dependent CP Asymmetry Asymmetry in t shape implies ICPV. Difference in area indicates DCPV
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15/12/2008from LHC to the UniverseP. Chang 5 Measurement in Principle Fully reconstruct a CP eigenstate. Determine the flavor the tag side. From the distance of the two B decay vertices to measure the decay time difference.
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15/12/2008from LHC to the UniverseP. Chang 6 Is there New physics? Is KM mechanism the source of CPV? Is KM mechanism the source of CPV? (Main reason why B factory was built?) (Main reason why B factory was built?) Is it the only source? New Physics? Is it the only source? New Physics? NP may appear in rare B decays. NP may appear in rare B decays. clean probe for NP. Bs not covered clean probe for NP. Bs not covered Current Universe SM not enough Direct or Indirect CP violation, branching fraction …
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15/12/2008from LHC to the UniverseP. Chang 7 The Duel of B Factories Mt. Tsukuba
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15/12/2008from LHC to the UniverseP. Chang 8 Successful Operation peak L =1.71x10 34 peak L =1.21x10 34 B Factory is also a charm factory. Bs physics can be studied when runs at (5S)
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15/12/2008from LHC to the UniverseP. Chang 9 Results Results
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15/12/2008from LHC to the UniverseP. Chang 10 Measurement of 1 / CP violation in the B system was already established.
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15/12/2008from LHC to the UniverseP. Chang 11 From all Measurements B factories: 1 ~2 o, 2 ~10 o, 3 ~15 o -30 o
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15/12/2008from LHC to the UniverseP. Chang 12 Time dependent CPV in b → s Penguin + sin2 /sin2 golden mode d d s s s S ~ 0 Stand Model New physics phase in the loop causes deviation May have tree pollution. Theoretical expectation: for penguin dominant modes S>0 within 0.05 Clean signals for new physics S = sin2 1 (sqq) – sin2 1 (ccs) S f = sin2 1 ; C f = A d d s s s
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15/12/2008from LHC to the UniverseP. Chang 13 S results before ICHEP 2008 PRL 99, 161802 (2007) Based on KKK Dalitz analysis PRL 98, 031802 (2007) 535 M ' K : sin2 1eff : +0.64± 0.10 ± 0.04 For most modes, S(SM) is positive.
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15/12/2008from LHC to the UniverseP. Chang 14 Decay Modes with Updated Results Class A: ’ K 0, K S Same method as J/ K 0 Class A: ’ K 0, K S Same method as J/ K 0 Class B: K 0 Class B: K 0 Class C: K S, K + K K S Class C: K S, K + K K S Class D: K S Class D: K S Class is characterized by the analysis complexity. No tracks on B decay vertex. Require tacks with SVD hits. Perform fit by constraining C. Model the Dalitz distributions. Many parameters: phase, S and C for each mode …. Low statistics. Need to know the CP content. Use results from K
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15/12/2008from LHC to the UniverseP. Chang 15 1 measured with penguins
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15/12/2008from LHC to the UniverseP. Chang 16 Time dependent Dalitz
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15/12/2008from LHC to the UniverseP. Chang 17 1 / with all penguin modes
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15/12/2008from LHC to the UniverseP. Chang 18 Direct CP Violation in B → K Decays Belle Results: Nature 452, 332 (2008) A cp (K ) = { Belle BaBar CDF CLEO A cp (K ) = { BaBar Belle CLEO @ 2.0 AVG @ AVG A K = cp (K - A cp (K ) = @ 5.3 New Update
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15/12/2008from LHC to the UniverseP. Chang 19 A K Puzzle T /T P TP CP EW Expectation from current theory T & P are dominant A K ~ 0 Enhancement of large C with large strong phase to T strong inter. !? Yoshikawa 2003; Mishima & Yoshikawa 2004; Buras et. al. 2004, 2006; Baek & London 2007; Hou et. al. 2007; Feldmann, Jung & Mannel 2008 Enhancement of large P EW New physics Chiang et. al. 2004 Li, Mishima & Sanda 2005
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15/12/2008from LHC to the UniverseP. Chang 20 Model independent checks for NP M. Gronau, PLB 627, 82 (2005); D. Atwood & A. Soni, Phys. Rev. D 58, 036005(1998). B → K P dominants. A cp (K )~ 0 B → K A cp (K ) A(K ) Sum rule predicts A cp (K ) = 0.151±0.043 A cp (K )= 0.009±0.025 A = ± 0.13 ± 0.03 World Average Sum rule A = 0.14 ± 0.13 ± 0.06 Important topic for Super B factory New HFAG AVG: 0.01
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15/12/2008from LHC to the UniverseP. Chang 21 First observation of direct CP violation in charged B decays Dalitz analysis on Dalitz analysis on 383M BB, PRD78, 012004, 08 A CP (B ± → K ± ) = (+44±10±4 )% @3.7 55 A CP (B ± → K ± ) = (+41±10±3 )% @4.0 33 77 657M BB, BELLE-CONF-0827 f K+K+ B+ all cos >0 cos 0
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15/12/2008from LHC to the UniverseP. Chang 22 B → ) x 10 B → ) x 10 B → B → In SM, decay rate related to decay constant and V ub Charged Higgs may contribute to BF. B (B → )= ( 0.78 )x10 (CKM fitter 2008 prediction) Previous results: Belle hadronic tagBaBar hadronic & semileptonic tags 447 M BB with 3.5 383 M BB with destructive W.S. Hou, PRD 48, 2342 (1993)
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15/12/2008from LHC to the UniverseP. Chang 23 New Belle Result on B → New Belle Result on B → NEW with 3.8 657 M BB with D ( * ) l tag N sig = 154 (stat) (syst) exclude signals Larger parameter space B ( → ) = (1.65 )x10 Tag on D ( * ) l Search for →e , , Check extra energy in ECAL Understand background from the control sample
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15/12/2008from LHC to the UniverseP. Chang 24 New BaBar Result on B → New BaBar Result on B → Tag on D ( * ) l look for →e, , ,
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15/12/2008from LHC to the UniverseP. Chang 25 Tension in the CKM fit BaBar ( B x10 4 ) Had. Tags1.79 Dl Tags 1.65 1.8±0.8±0.1 Belle ( B x10 4 ) 1.8 ±0.4 My Avg. B = (1.73±0.35)x10 CKM fitter obtained B = (0.78 ) x10 deviation = 2.6 B = (1.2 ±0.4) x10 -4 using Note that interference is destructive in 2HDM (type II). B > B SM implies that H contribution dominates
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15/12/2008from LHC to the UniverseP. Chang 26 B (B → ) vs sin2 1 /2 Using ratio, the relation is independent of f B and Vub Belle and BaBar will have new updates soon. Good topics for the future Super B factory 1 deviation
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15/12/2008from LHC to the UniverseP. Chang 27 B→Xs B→Xs B→Xs B→Xs Belle update with E >1.7 GeV: arXiv:0804.1580 SM NNLO calculation: HFAG 2008: B ( B →X s = (3.52 ±0.25)x10 E > 1.6 GeV Misiak et al. B ( B →X s ) | E > 1.6 GeV = (2.98±0.26)x10 (3.47±0.49)x10 Anderson Gardi { SM (3.15±0.23)x10 New physics Becher Neubertv E min
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15/12/2008from LHC to the UniverseP. Chang 28 Charged Higgs Bound HFAG 2008 M H + > 300 GeV/c 2 @ 95% C.L. for all tan The 95% lower bound of charged Higgs mass as a function of B (B → X s ) and its error.
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15/12/2008from LHC to the UniverseP. Chang 29 b → s l l b → s l l Loop dominant Small BF ; good place for new physics! Loop dominant Small BF ; good place for new physics! Contributions from three coefficients: Contributions from three coefficients: C 7 : EM penguin; C 9 (C 10 ): vector (axial vector) part of weak diagrams C 7 : EM penguin; C 9 (C 10 ): vector (axial vector) part of weak diagrams More observables sensitive to NP: More observables sensitive to NP: eff FB lepton asymmetry, A FB K* polarization, FL CP asymmetry, A CP Isospin asymmetry e ratio A FB (q 2 ): e e indication of Z 0 s l l b s l l L eff = C i O i, C i (short distance effect). SM expects real C i SM
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15/12/2008from LHC to the UniverseP. Chang 30 Obtain partial BF in 6 bins in q 2 ; extrapolate the total BF. Obtain partial BF in 6 bins in q 2 ; extrapolate the total BF. BF(B K*ll)=(10.8±1.0±0.9) x10 -7 BF(B K*ll)=(10.8±1.0±0.9) x10 -7 BF(B Kll)=(4.8 ±0.3) x10 -7 BF(B Kll)=(4.8 ±0.3) x10 -7 Good agreement with SM BF B K*llB Kll 657M, NEW BF(B K*ll)= (11.1±1.9±0.7) x10 -7 BF(B K*ll)= (11.1±1.9±0.7) x10 -7 BF(B Kll)= (3.9±0.7±0.2) x10 -7 BF(B Kll)= (3.9±0.7±0.2) x10 -7 FPCP 08 384M 0.5 Belle, ICHEP 08 BABAR, FPCP 08 Melikhov et. al (quark model, PLB 410, 1997) Ali (PRD 66, 034002, 290, 2002) Veto events in the J/ and ’ regions photon pole
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15/12/2008from LHC to the UniverseP. Chang 31 Obtain partial BF in 6 bins in q 2 ; extrapolate the total BF. Obtain partial BF in 6 bins in q 2 ; extrapolate the total BF. BF(B K*ll)=(10.8±1.0±0.9) x10 -7 BF(B K*ll)=(10.8±1.0±0.9) x10 -7 BF(B Kll)=(4.8 ±0.3) x10 -7 BF(B Kll)=(4.8 ±0.3) x10 -7 Good agreement with SM BF B K*llB Kll 657M, NEW BF(B K*ll)= (11.1±1.9±0.7) x10 -7 BF(B K*ll)= (11.1±1.9±0.7) x10 -7 BF(B Kll)= (3.9±0.7±0.2) x10 -7 BF(B Kll)= (3.9±0.7±0.2) x10 -7 FPCP 08 384M 0.5 Belle, ICHEP 08 BABAR, FPCP 08 Melikhov et. al (quark model, PLB 410, 1997) Ali (PRD 66, 034002, 290, 2002) Veto events in the J/ and ’ regions Belle, 08 ’ ICHEP BABAR, 08 ’ FPCP CDF, 06 ’ CKM Ali 02 ’ photon pole
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15/12/2008from LHC to the UniverseP. Chang 32 Lepton Flavor & CP Asymmetries A CP In SM, R K ~ 1.33 and R K ~1.0. R K is sensitive to the size of photon pole. R K >1.0 in the two Higgs doublet model with large tanβ. (Y. Wang and D. Atwood, PRD 68, 094016, 2003) R K = B (B → K ( * ) ee) B (B → K ( * ) )
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15/12/2008from LHC to the UniverseP. Chang 33 Unexpectedly Large Isospin Asymmetry?
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15/12/2008from LHC to the UniverseP. Chang 34 K* Helicity Distribution Obtain FL by a fit:
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15/12/2008from LHC to the UniverseP. Chang 35 Anomalous A FB (q 2 ) in B → K ( * ) ll ? Obtain A FB by a fit: 657 M BB 384 M BB Data show positive A FB at low q 2, while the SM predicts negative A FB. At high q 2, data above the SM expectation. Efficiency corrected
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15/12/2008from LHC to the UniverseP. Chang 36 Conclusion Results start to probe NP but limited by statistics: → A FB, isospin asymmetry B (B Xs ) strong constraint to NP N eed much more data to confirm the S puzzle. A explanation if from new physics, what is it? LHCb: Bs, A FB on K*ll, Bs,d ll, … Super B factory: B → K* cp Look for the approval of Super KEKB in 2009!
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15/12/2008from LHC to the UniverseP. Chang 37 Backup Slides
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15/12/2008from LHC to the UniverseP. Chang 38 More on A FB C 7 = C 7 ? If yes, B will change! The sign of C 7 is constrained by B (Xsll). C may be complex due to new physics. SM Gambino et. al, PRL94, 061803, 05 Hou et. Al, PRD77, 014016, 08 Points LHCb 2 fb 1 MC Dashed area: complex C Black line: SM Blue: 4th generation ŝ = q 2 /M 2 (l l )
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15/12/2008from LHC to the UniverseP. Chang 39 Direct CP Violation on B → X s BaBar measurement using sum of 16 exclusive modes arXiv: 0805.4796 383 M BB SM expectation by Kagan & Neubert, PRD58, 094012 (1998) A CP ~ (0.5±0.2)% small CP asymmetry A CP = ± 0.030 (stat.) ± 0.014 (syst.)
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15/12/2008from LHC to the UniverseP. Chang 40 tCPV on Radiative Penguin No CPV seen before; this conference: No CPV seen before; this conference: K* region K0K0K0K0 K KKKK 1.2<M(K )<1.6 - - - - + B0B0 K*0K*0 LL B0B0 K*0K*0 RR M 12 R m s /m b suppressed L m s /m b suppressed Interference suppressed in SM
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15/12/2008from LHC to the UniverseP. Chang 41 TCPV on B K K L evts K S evts First Try NEW 556 ± 32 evts For S, use candidates with SVD hits For C, all signals
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15/12/2008from LHC to the UniverseP. Chang 42 TCPV on B K K L evts K S evts First Try NEW 556 ± 32 evts For S, use candidates with SVD hits For C, all signals BaBar Belle S +0.55±0.20±0.03 0.67±0.31±0.08 C= A 0.13±0.13±0.03 0.14±0.13±0.06
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15/12/2008from LHC to the UniverseP. Chang 43 TCPV on ' K , K S and K S NEW 467 M BB S C = A ' K 0.57±0.08±0.02 0.08±0.06±0.02 K S 0.55 ±0.02 0.52 ±0.03 K S 0.97 0.20±0.14±0.06 0.26 0.29 0.22 0.20 0.03 0.52 final dataset See Hirschauer’s talk for details. For K , polarizations, yields, Acp … are constrained with K KK
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15/12/2008from LHC to the UniverseP. Chang 44 T-dependent Dalitz on K 657 M BB NEW (K S NR K S NR NR K S K* K* Decay modes considered f K S f K S f X K difference as systematic errors S
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15/12/2008from LHC to the UniverseP. Chang 45 T-dependent Dalitz on K K K 657 M BB NEW Model uses f K S K S f X K S c K S K S K NR K K K NR K S S
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15/12/2008from LHC to the UniverseP. Chang 46 Future Prospects for A FB (q 2 ) SuperB 5ab MC study of SuperB SuperB 50 ab MC study of SuperB b EXP, SM MSSM C 7geff >0 ATLAS 30 fb LHCb fb
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15/12/2008from LHC to the UniverseP. Chang 47 Future Prospects for A FB (q 2 ) SuperB 5ab MC study of SuperB SuperB 50 ab MC study of SuperB b EXP, SM MSSM C 7geff >0 ATLAS 30 fb LHCb fb CDF and D0, please contribute!
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