PuzzlesornewphysicssignalinBphysics呂才典IHEP,Beijing

CDLu1PuzzlesornewphysicssignalCurrentBphysicsexperimentsEnhancementofcolorsuppressedmodesDirectCPasymmetry/AnnihilationMixinginducedCPasymmetryPolarizationsinBVVdecaysSummaryOutlineCDLu2CurrentBphysicsexperimentsO高能物理實(shí)驗(yàn)發(fā)展方向更高能量：Tevatron,LHC，ILC，––直接對(duì)新粒子，新物理的探索更高亮度：B工廠，tau－粲工廠等––精確檢驗(yàn)，間接新物理的探索，更經(jīng)濟(jì)對(duì)超對(duì)稱(chēng)等新物理模型的參數(shù)限制大多來(lái)源于B物理實(shí)驗(yàn)肖振軍、楊亞?wèn)|有很多研究CDLu3高能物理實(shí)驗(yàn)發(fā)展方向更高能量：Tevatron,LHC，IKEKSLACCurrentBfactoriesBaBarPEPIIKEKBBelleCDLu4KEKSLACCurrentBfactoriesBaBaBFactoryExperimentsKEK,KEKB，e+8GeV,e–3.5GeVBelle:700MillionBB-barpairSLAC,PEP-II,e+9GeV,e–3.1GeVBaBar:400MillionBB-barpairTheycanreachbranchingratiosassmallas10–7rareBdecaysCDLu5BFactoryExperimentsKEK,KEKB

d’VudVus

Vubds’=Vcd

Vcs

Vcbsb’VtdVts

VtbbUnitarityVudVub*+VcdVcb*+VtdVtb*=0Thetrianglesaremeasuredmainlythroughnon-leptonicB(bd)decaysForexample:α

byB→ππ,πρ,

α

β

byB→J/ψK,K

VudVub*

VtdVtb*

γ

byB→Kπ,Bs→Kρ,

γ

β

VcdVcb*CDLu6d’VudVusCurrentCKMmeasurements標(biāo)準(zhǔn)模型可以很好地解釋目前的實(shí)驗(yàn)CDLu7CurrentCKMmeasurements標(biāo)準(zhǔn)模型可以CLEO實(shí)驗(yàn)組(已降能區(qū))Belle@KEK

和BaBar@SLAC工作在B物理的能區(qū),現(xiàn)在正在取數(shù).Tevatron實(shí)驗(yàn)室上也有很多Bs的數(shù)據(jù)2007年底即將運(yùn)行的LHC-b籌劃中Super-B......

thesizeofCPviolationisnotbigenoughforcosmology實(shí)驗(yàn)狀況CDLu8CLEO實(shí)驗(yàn)組(已降能區(qū))實(shí)驗(yàn)狀況CDLu8Bpipidecays

ModeExppQCD(LO)NLOdduuCDLu9BpipidecaysModeBpipidecaysTree(T),colorsuppressedtree(C),penguin(P)CDLu10BpipidecaysTree(T),colorTwooperatorscontributeto

decay:

B0

0B0

0

colorenhanced

colorsuppressed

C1~–0.2~1/3C2~1/3

dduuCDLu11Twooperatorscontributeto

IsospintriangleD+–(a1)D0+(a1+a2)D00(a2)Laterexperimentsfoundmuch

larger

B0D0pi0branchingratiosCDLu12IsospintriangleD+–(a1)D0+For

decay,thesetwodiagramsdonotcancelD+–(a1)D0+(a1+a2)D00(a2)arg(a2/a1)~–41°CDLu13Fordecay,tBranchingratiosofBD(*)modesFac.APQCDEXP.D*+

–

292527.6±2.1D+

–

302730±4D*0

01.02.81.7±0.5D0

0

0.72.52.9±0.5D*0+

485346±4D0

+

485453±5PQCD:Keumetal,PRD69:094018,2004

a1=1.08a2=0.21forFact.Approach(x10–4)CDLu14BranchingratiosofBD(*)modDirectCPviolationCDLu15DirectCPviolationCDLu15DirectCPViolationRequiretwokindsofdecayamplitudeswith:Differentweakphases(SM)Differentstrongphases–needhadroniccalculation,usuallynon-perturbativeCDLu16DirectCPViolationRequiretwoB→,KHaveTwoKindsofDiagramswithdifferentweakphase

b

WuTree∝VubVud*(s)B

d(s)

(K)

W

b

tPenguin∝VtbVtd*(s)B

O3,O4,O5,O6O1,O2(K)CDLu17B→,KHaveTwoKindsofDiaCDLu18CDLu18StrongphaseisimportantfordirectCPButusuallycomesfromnon-perturbativedynamics,forexampleDKKKForBdecay,perturbativedynamicmaybemoreimportantCDLu19StrongphaseisimportantforCutquarkdiagram~Sumoverfinal-statehadrons~On-shellOff-shellhadronsInclusiveDecayCDLu20Cutquarkdiagram~Sumoverfpseudo-scalarBrequiresspinsinoppositedirections,namely,helicityconservationmomentumBfermionflowspin(thisconfigurationisnotallowed)p1p2Annihilationsuppression~1/mB~

10%LikeBeeFor(V-A)(V-A),left-handedcurrentCDLu21pseudo-scalarBrequiresspNosuppressionforO6Space-likepenguinBecome(s-p)(s+p)operatorafterFiertztransformationChirallyenhancedNosuppression,contribution“big”(20-30%)dud+(K+)–CDLu22NosuppressionforO6Space-likChiralEnhancementTwopenguinoperators:O4~(V-A)(V-A)O6~(V-A)(V+A)

bsqtR,L=15Fiertztrans.O(1)(S+P)(S-P)2mK2/(msmB)CDLu23ChiralEnhancementTwopenguinCPViolationinB

(K)

(realpredictionbeforeexp.)CP(%)FABBNSPQCDExp+K–+9±3+5±9–17±5–9.7±1.20K++8±27±9–13±44.7±2.6+K01.7±0.11±1–1.0±0.50.9

±2.5

+––5±3–6±12+30±10+38±7(2001)CDLu24CPViolationinB(K)

(reBKpuzzleK+-andK+0differbysubleadingamplitudesPewandC.TheirCPareexpectedtobesimilar.Theirdatadifferby5!Apuzzle!

ACP(K+pi–)=(–9.51.3)%ACP(K+pi–)=(4.72.6)%CDLu25BKpuzzleK+-andK+0diffAmplitudeparametrization(C2/C4)(VusVub/VtsVtb)?(1/2)(5/2)?

CDLu26Amplitudeparametrization(C2/CDirectCPviolationTexp(i3)PTexp(-i3)Texp(i3)PTexp(-i3)IfT=0BrBr=BrIfT=0Br=BrDirectCPRecallCDLu27DirectCPviolationTexp(i3)PExplanation1LargeK+-CPimplieslargeT(predictedbyPQCDin2000)LargePEWtocancelitseffect(Burasetal.;Yoshikawa)inK+0

newphysics?

Texp(i3)PTexp(-i3)PEWBr?BrCDLu28Explanation1LargeK+-CPimpExplanation2OrlargeCtocancelitseffect(CharngandLi;HeandMcKellar)inK+0)mechanismmissedinSMcalculation?

(T+C)exp(i3)(T+C)exp(-i3)Texp(i3)PCDLu29Explanation2OrlargeCtocanCDLu30CDLu30MixinginducedCPviolationCDLu31MixinginducedCPviolationCDDeviationfromBJ/psiKsCDLu32DeviationfromBJ/psiKsCDLCDLu33CDLu332007resultCDLu342007resultCDLu34CDLu35CDLu35MixingInducedCPB+–,K,’K,KKK…DominantbytheB-BbarmixingMostoftheapproachesgivesimilarresultsEvenwithfinalstateinteractionsCDLu36MixingInducedCPB+–,K,ForExample:(FromYossiNir)CDLu37ForExample:(FromYossiNir)CPolarizationofBVVdecaysQCDF0.940.950.910.94CDLu38PolarizationofBVVdecaysQCDNewphysics(Grossman;Yangetal.;Giri,Mohanta;Dasetal.)AnnihilationeffectinQCDF(Kagan)CharmingpenguininSCET(Baueretal)Rescatteringeffect(Colangeloetal.;Ladisaetal.;Cheng,Chua,Soni)Exoticbsg(Hou,Nagashima)PlausibleresolutionsCDLu39Newphysics(Grossman;YangetPreviouspQCDRL=75%forBK*phi

ToolargeBrsthanexp.ImpliestoolargeformfactorSofar,nodata,exceptK*,controlA0B

()K*aregovernedbyB

()formfactors=>A0forBK*couldbesmaller?ChoosetheasymptoticmodelsforthecorrespondingK*mesondistributionamplitudes

A0=0.28CDLu40PreviouspQCDRL=75%forBAnnihilationcanenhancetransversecontribution:RL=59%(exp:50%)

andalsorightratioofR=,Randrightstrongphase

=,dsdLargetransversecomponentinBK*decaysK*H-nLi,Phys.Lett.B622,68,2005

CDLu41AnnihilationcanenhancetrPolarizationofBVVdecaysQCDF0.940.950.910.94Newphysics?CDLu42PolarizationofBVVdecaysQCDNewphysicsatTeVPromisinghypothesesthatpredictnewelementaryparticlesintheTeVscale(SUSY,extra-dimension,etc.)Moreambitiousproposalsthatincorporateflavorsymmetries(andviolation)toanswerthedeeperquestionsofflavorphysics.NewCP-violatingphasesandnewinteractionsofquarksandleptonsalmostexpectableCDLu43NewphysicsatTeVPromisinghyNewphysicsatTeVNewparticlesmustcomewithNewFlavorMixing.Manymodels/hypothesesExperimentsshoulddecideCDLu44NewphysicsatTeVNewparticleSummaryThecurrentCPmeasurementsareconsistentwiththestandardmodelpredictions.Althoughtherearestillsomepuzzles

Newphysicsarestillfarawayfromus!?LHCorSuperBfactoriesshouldanswerCDLu45SummaryThecurrentCPmeasuremThankyou!CDLu46Thankyou!CDLu46演講完畢，謝謝觀看！演講完畢，謝謝觀看！PuzzlesornewphysicssignalinBphysics呂才典IHEP,Beijing

CDLu48PuzzlesornewphysicssignalCurrentBphysicsexperimentsEnhancementofcolorsuppressedmodesDirectCPasymmetry/AnnihilationMixinginducedCPasymmetryPolarizationsinBVVdecaysSummaryOutlineCDLu49CurrentBphysicsexperimentsO高能物理實(shí)驗(yàn)發(fā)展方向更高能量：Tevatron,LHC，ILC，––直接對(duì)新粒子，新物理的探索更高亮度：B工廠，tau－粲工廠等––精確檢驗(yàn)，間接新物理的探索，更經(jīng)濟(jì)對(duì)超對(duì)稱(chēng)等新物理模型的參數(shù)限制大多來(lái)源于B物理實(shí)驗(yàn)肖振軍、楊亞?wèn)|有很多研究CDLu50高能物理實(shí)驗(yàn)發(fā)展方向更高能量：Tevatron,LHC，IKEKSLACCurrentBfactoriesBaBarPEPIIKEKBBelleCDLu51KEKSLACCurrentBfactoriesBaBaBFactoryExperimentsKEK,KEKB，e+8GeV,e–3.5GeVBelle:700MillionBB-barpairSLAC,PEP-II,e+9GeV,e–3.1GeVBaBar:400MillionBB-barpairTheycanreachbranchingratiosassmallas10–7rareBdecaysCDLu52BFactoryExperimentsKEK,KEKB

d’VudVus

Vubds’=Vcd

Vcs

Vcbsb’VtdVts

VtbbUnitarityVudVub*+VcdVcb*+VtdVtb*=0Thetrianglesaremeasuredmainlythroughnon-leptonicB(bd)decaysForexample:α

byB→ππ,πρ,

α

β

byB→J/ψK,K

VudVub*

VtdVtb*

γ

byB→Kπ,Bs→Kρ,

γ

β

VcdVcb*CDLu53d’VudVusCurrentCKMmeasurements標(biāo)準(zhǔn)模型可以很好地解釋目前的實(shí)驗(yàn)CDLu54CurrentCKMmeasurements標(biāo)準(zhǔn)模型可以CLEO實(shí)驗(yàn)組(已降能區(qū))Belle@KEK

和BaBar@SLAC工作在B物理的能區(qū),現(xiàn)在正在取數(shù).Tevatron實(shí)驗(yàn)室上也有很多Bs的數(shù)據(jù)2007年底即將運(yùn)行的LHC-b籌劃中Super-B......

thesizeofCPviolationisnotbigenoughforcosmology實(shí)驗(yàn)狀況CDLu55CLEO實(shí)驗(yàn)組(已降能區(qū))實(shí)驗(yàn)狀況CDLu8Bpipidecays

ModeExppQCD(LO)NLOdduuCDLu56BpipidecaysModeBpipidecaysTree(T),colorsuppressedtree(C),penguin(P)CDLu57BpipidecaysTree(T),colorTwooperatorscontributeto

decay:

B0

0B0

0

colorenhanced

colorsuppressed

C1~–0.2~1/3C2~1/3

dduuCDLu58Twooperatorscontributeto

IsospintriangleD+–(a1)D0+(a1+a2)D00(a2)Laterexperimentsfoundmuch

larger

B0D0pi0branchingratiosCDLu59IsospintriangleD+–(a1)D0+For

decay,thesetwodiagramsdonotcancelD+–(a1)D0+(a1+a2)D00(a2)arg(a2/a1)~–41°CDLu60Fordecay,tBranchingratiosofBD(*)modesFac.APQCDEXP.D*+

–

292527.6±2.1D+

–

302730±4D*0

01.02.81.7±0.5D0

0

0.72.52.9±0.5D*0+

485346±4D0

+

485453±5PQCD:Keumetal,PRD69:094018,2004

a1=1.08a2=0.21forFact.Approach(x10–4)CDLu61BranchingratiosofBD(*)modDirectCPviolationCDLu62DirectCPviolationCDLu15DirectCPViolationRequiretwokindsofdecayamplitudeswith:Differentweakphases(SM)Differentstrongphases–needhadroniccalculation,usuallynon-perturbativeCDLu63DirectCPViolationRequiretwoB→,KHaveTwoKindsofDiagramswithdifferentweakphase

b

WuTree∝VubVud*(s)B

d(s)

(K)

W

b

tPenguin∝VtbVtd*(s)B

O3,O4,O5,O6O1,O2(K)CDLu64B→,KHaveTwoKindsofDiaCDLu65CDLu18StrongphaseisimportantfordirectCPButusuallycomesfromnon-perturbativedynamics,forexampleDKKKForBdecay,perturbativedynamicmaybemoreimportantCDLu66StrongphaseisimportantforCutquarkdiagram~Sumoverfinal-statehadrons~On-shellOff-shellhadronsInclusiveDecayCDLu67Cutquarkdiagram~Sumoverfpseudo-scalarBrequiresspinsinoppositedirections,namely,helicityconservationmomentumBfermionflowspin(thisconfigurationisnotallowed)p1p2Annihilationsuppression~1/mB~

10%LikeBeeFor(V-A)(V-A),left-handedcurrentCDLu68pseudo-scalarBrequiresspNosuppressionforO6Space-likepenguinBecome(s-p)(s+p)operatorafterFiertztransformationChirallyenhancedNosuppression,contribution“big”(20-30%)dud+(K+)–CDLu69NosuppressionforO6Space-likChiralEnhancementTwopenguinoperators:O4~(V-A)(V-A)O6~(V-A)(V+A)

bsqtR,L=15Fiertztrans.O(1)(S+P)(S-P)2mK2/(msmB)CDLu70ChiralEnhancementTwopenguinCPViolationinB

(K)

(realpredictionbeforeexp.)CP(%)FABBNSPQCDExp+K–+9±3+5±9–17±5–9.7±1.20K++8±27±9–13±44.7±2.6+K01.7±0.11±1–1.0±0.50.9

±2.5

+––5±3–6±12+30±10+38±7(2001)CDLu71CPViolationinB(K)

(reBKpuzzleK+-andK+0differbysubleadingamplitudesPewandC.TheirCPareexpectedtobesimilar.Theirdatadifferby5!Apuzzle!

ACP(K+pi–)=(–9.51.3)%ACP(K+pi–)=(4.72.6)%CDLu72BKpuzzleK+-andK+0diffAmplitudeparametrization(C2/C4)(VusVub/VtsVtb)?(1/2)(5/2)?

CDLu73Amplitudeparametrization(C2/CDirectCPviolationTexp(i3)PTexp(-i3)Texp(i3)PTexp(-i3)IfT=0BrBr=BrIfT=0Br=BrDirectCPRecallCDLu74DirectCPviolationTexp(i3)PExplanation1LargeK+-CPimplieslargeT(predictedbyPQCDin2000)LargePEWtocancelitseffect(Burasetal.;Yoshikawa)inK+0

newphysics?

Texp(i3)PTexp(-i3)PEWBr?BrCDLu75Explanation1LargeK+-CPimpExplanation2OrlargeCtocancelitseffect(CharngandLi;HeandMcKellar)inK+0)mechanismmissedinSMcalculation?

(T+C)exp(i3)(T+C)exp(-i3)Texp(i3)PCDLu76Explanation2OrlargeCtocanCDLu77CDLu30MixinginducedCPviolationCDLu78MixinginducedCPviolationCDDeviationfromBJ/psiKsCDLu79DeviationfromBJ/psiKsCDLCDLu80CDLu332007resultCDLu812007resultCDLu34CDLu82CDLu35MixingInducedCPB+–,K,’K,KKK…DominantbytheB-BbarmixingMostoftheapproachesgivesimilarresultsEvenwithfinalstateinteractionsCDLu83MixingInducedCPB+–,K,ForExample:(FromYossiNir)CDLu84ForExample:(FromYossiNir)CPolarizationofBVVdecaysQCDF0.940.950.910.94CDLu85PolarizationofBVVdecaysQCDNewphysics(Grossman;Yangetal.;Giri,Mohanta;Dasetal.)AnnihilationeffectinQCDF(Kagan)CharmingpenguininSCET(B