hhTheory of Direct CP Violation in DHai-YangCheng（海揚）Academia Sinica, TaipeiDiagrammaticalapproachSU(3) breakingCP violation at treeand loop levels2012年雨岸粒子物理興宇宙學研會Chongqing,May8,2012
Theory of Direct CP Violation in D hh Chongqing, May 8, 2012 Hai-Yang Cheng (鄭海揚) Academia Sinica, Taipei ⚫ Diagrammatical approach ⚫ SU(3) breaking ⚫ CP violation at tree and loop levels 2012年兩岸粒子物理與宇宙學研討會
Stratage insearch of NPNull resultsinSM:idealplacetolookfornewphysicsinBSMBsμtuβ.:CP-oddphaseinB.systemICPviolationinB-元元0ILeptonnumberviolation(tdecay)ICPviolationincharmedmeson:Do-Dmixing,DCPV2.Takeacueformthecurrentanomalies:B→TVsin2ββsB-cPpuzzles,especially△Ak元like-signdimuonasymmetryforward-backwardasymmetryinB'→K*μ+μpolarizationpuzzle2
2 1. Null results in SM: ideal place to look for new physics in BSM ◼ Bs + - ◼ s : CP-odd phase in Bs system ◼ CP violation in B- - 0 ◼ Lepton number violation ( decay) ◼ CP violation in charmed meson: D0 -D 0 mixing, DCPV ◼ . 2. Take a cue form the current anomalies: ◼ B→ ◼ sin2 ◼ s ◼ B-CP puzzles, especially AK ◼ like-sign dimuon asymmetry ◼ forward-backward asymmetry in B0→ K*0 + - ◼ polarization puzzle ◼ . Stratage in search of NP
ExperimentI(D-→ f(t)-I(D -→ f(t)Acp(f(t)Time-dependentCPasymmetryI(D-→ f(t)+T(D -→f(t)<t)ind(f)Acp(f)= acr(f) +Time-integratedasymmetryLHCb:(11/14/2011)0.92fb-1basedon60%of2011data△AXII=AXII(K+K-)-AXII(元+元-)=- (0.82±0.21±0.11)%3.5oeffect: firstevidenceof CPvincharmsectorCDF:(11/21/2011)5.9fb-1ACP(K+K-)= -(0.24 0.22 0.09)%, ACP( +-)= (0.22 0.24 0.11)%△AXII=- (0.46±0.31±0.11)%CDF:(2/29/2012) 9.7fb-10.15)%ACP=Araw(K+K-) -Araw( + -)=-(2.330.14)% -(-1.71= - (0.62 0.21 0.10)%willmeasureACP(K+K-)&ACP(+-)separately3
3 Experiment ( ( )) ( ( )) ( ( )) ( ( )) ( ( )) D f t D f t D f t D f t A f t CP → + → → - → Time-dependent CP asymmetry = Time-integrated asymmetry ( ) ( ) a ( f ) t A f a f ind CP dir CP CP = + LHCb: (11/14/2011) 0.92 fb-1 based on 60% of 2011 data ACP ACP(K+K-) - ACP(+-) = - (0.820.210.11)% 3.5 effect: first evidence of CPV in charm sector CDF: (11/21/2011) 5.9 fb-1 ACP(K+K-)= - (0.24 0.22 0.09)%, ACP( + -) = (0.22 0.24 0.11)% ACP = - (0.460.310.11)% CDF: (2/29/2012) 9.7 fb-1 ACP= Araw(K+K-) - Araw( + -)= - (2.33 0.14)% - (-1.71 0.15)% = - (0.62 0.21 0.10)% will measure ACP(K+K-) & ACP( + -) separately
NewworldaveragesofLHCb+CDF+BaBar+BelleAαXI18tp=-(0.656±0.154)%, 4.3 Φ%taCPind =-(0.0250.235)%0.0268HFAG-chamBeforeclaimingnewphysicseffects,AcBaBaevAcBelle0.015MAoLHCBACDFPrelin0.01itisimportanttohaveareliableSM,LHCDA,BaBarBelle0.005estimate of AAcP0-0.005Canwehavereliableestimateofstrong0.01phasesand hadronicmatrixelements?-0.015-0.020.02-0.015-0.01-0.005CantheLHCbresultbeaccommodated0.0050.010.0150.020alcpinSM?Giventheexpt'Iresults,canonepredictDCPVinothermodes?
4 New world averages of LHCb + CDF + BaBar + Belle aCPdir = -(0.6560.154)%, 4.3 effec aCPind = -(0.025 0.235)% Before claiming new physics effects, it is important to have a reliable SM estimate of ACP ⚫ Can we have reliable estimate of strong phases and hadronic matrix elements ? ⚫ Can the LHCb result be accommodated in SM ? ⚫ Given the expt’l results, can one predict DCPV in other modes ?
VudCabibbofavoredVesDVVudusVcdVcssinglyCabibbo-suppressedLusVcddoublyCabibbo-suppressed5
5 Vcs Vud Vcd Vud Vcd Vus Vcs Vus Cabibbo favored singly Cabibbo-suppressed doubly Cabibbo-suppressed D