new physics on rare and doubly cabibbo-suppressed d ...

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1、NewPhysicsonRareandDoublyCabibbo-SuppressedDDecaysChuan-HungChenDepartmentofPhysics,NationalCheng-KungU.,Tainan,Taiwanpp7@08.06.07.ntu.twEvidenceforD0D0barmixing&theimplicationsSummaryNewphysicsonD0K+IncollaborationwithC-QGeng&S-HNamNewphysicsonlifetime

2、differenceinmixing1PPbaroscillationsareimportantIntheSM,FCNCinducedfromloopeffects,boxdiagrams--GIMmechanismtoKKbarmixing,mK--Heavytop-quarkmassenhancementtoBBbarmixing,mBqDuetotheseeffectsinducedfromloops,theyaresensitivetothenewphysics,e.g.--ExceptD

3、Dbarmixing,KKbar,BqBqbarareobserved--NewCPviolatingphaseon--NewPhysicson2NewPhysicsonRareandDCSDHowisD0D0barmixing?StrongGIMcancellation,noheavyquarkenhancement,short-distanceeffectsarenegligible;long-distanceeffectsaredominantWithSU(3)Flimit,itvanishes

4、Non-zerocontributionsareassociatedwithSU(3)breaking,i.e.(ms)nHeavy-quarkeffectivetheorywithOPEGeorgi(‘92),Bigi&Uraltsev(’01),Exclusiveapproach,Donoghue,Golowich,Holstein,Trampetic(’86);Petrov(’97);Falk,Grossman,Ligeti,Petrov(’02)withlargeuncertainityCPVisne

5、gligible3EvidenceforD-DbarmixingobservedbyBabar,arXive:hep-ex/0703020,PRL98,211802(’07)&Belle,arXive:hep-ex/0703036,PRL98,211803(’07)InterferencemixingWithdoublyCabibbo-suppressed(DCS)decaysD0K+4NosignalforCPviolation5WithsinglyCabibbo-suppresseddecaysD0

6、K+KNosignalforCPviolation6NewPhysicsonRareandDCSDNewphysicsondoublyCabibbo-Suppressed(DCS)D0K+IntheSMThedefinitionofRDWithSU(3)limit,7NewPhysicsonRareandDCSDBabar’sresultinhep-ex/0703020Factorizationassumption&SU(3)breaking&DataforIndicationofnewphysic

7、sFactorizationassumptionSemileptonicdecaysPFPK[Gao,PLB645,59(‘07)]8NewPhysicsonRareandDCSDLeft-rightmodelonDCSDdecayLeft-rightModel:SU(2)LSU(2)RU(1)X--TwochargedgaugebosonsWLandWR--BothwillmixtobeW1WL--BesidesCKMmatrixforleft-handedquark,nowwehavesimila

8、rflavormixingeffectsforright-handedquark--LRsymmetricmodel,gL=gR,V(L)=V(R),thecontributionswillbemuchsmallerthanthoseintheSM9NewPhysicsonRareandDCSDTherelativesizebetweenSMandLRmodelsallthehadroniceffe