General Analysis of New Physics in $Bto Jpsi K$

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1、DESY01–006CERN–TH/2001–012TTP01–06hep–ph/0101276January2001GeneralAnalysisofNewPhysicsinB→J/ψKRobertFleischer∗DeutschesElektronen-SynchrotronDESY,Notkestraße85,D–22607Hamburg,GermanyThomasMannel†CERNTheoryDivision,CH–1211Geneva23,SwitzerlandandInstitutf¨urTheoretischeTeilchenphysik,Uni

2、versit¨atKarlsruhe,D–76128Karlsruhe,GermanyarXiv:hep-ph/0101276v124Jan2001AbstractWepresentamodel-independentparametrizationoftheB±→J/ψK±,B→J/ψKdecaydSamplitudesbytakingintoaccounttheconstraintsthatareimpliedbytheisospinsymmetryofstronginteractions.Employingestimatesborrowedfromeffectiv

3、efieldtheory,weexploretheimpactofphysicsbeyondtheStandardModelandintroduce–inadditiontotheusualmixing-inducedCPasymmetryAmixinB→J/ψK–asetofthreeobservables,allowingCPdSageneralanalysisofpossiblenew-physicseffectsintheB→J/ψKsystem.Imposingadynamicalhierarchyofamplitudes,wearguethatoneofth

4、eseobservablesmayalreadybeaccessibleatthefirst-generationB-factories,whereastheremainingoneswillprobablybeleftforsecond-generationBexperiments.However,inthepresenceoflargerescatteringeffects,allthreenew-physicsobservablesmaybesizeable.WealsoemphasizethatasmallvalueofAmixcouldbeduetonew-p

5、hysicseffectsarisingattheB→J/ψKdecay-amplitudelevel.InCPordertoestablishsuchascenario,theobservablesintroducedinthispaperplayakeyrole.∗E-mail:Robert.Fleischer@desy.de†E-mail:Thomas.Mannel@cern.ch1IntroductionAtpresent,weareatthebeginningoftheB-factoryerainparticlephysics,whichwillprovid

6、evaluableinsightsintoCPviolationandvarioustestsoftheKobayashi–Maskawapictureofthisphenomenon[1].AmongthemostinterestingB-decaychannelsisthe“gold-plated”modeBd→J/ψKS[2],whichallowsthedeterminationoftheangleβoftheunitaritytriangleoftheCabibbo–Kobayashi–Maskawa(CKM)matrix[3].Inthesummerof

7、2000–afterimportantstepsatLEP[4]andbytheCDFcollaboration[5]–thefirstresultsonCP-violatingeffectsinBd→J/ψKSwerereportedbytheBaBar[6]andBelle[7]collaborations,whichalreadyledtosomeexcitementintheB-physicscommunity[8].Inthispaper,weconsidertheneutralmodeBd→J/ψKStogetherwithitschargedcoun-