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1、WeiWangInstituteofHighEnergyPhysicsFinalStateInteractionsinBtoKKmodesBasedon:Cai-dianLv,Yue-LongShenandWeiWang,Phys.Rev.D73:034005,20062021/9/181全国第四届重味物理和CP破坏研讨会TherearemanydifferenteditionsofFinalStateInteractions(FSIs)intheliterature.Here,weusetheeditiongivenby:Finalstateinterac
2、tionsinhadronicBdecays,H.Y.Cheng,C.K.ChuaandA.Soni,Phys.Rev.D71,014030(2005)2021/9/182全国第四届重味物理和CP破坏研讨会OutlineMotivationFrameworkofFSIsFSIsinBtoKKanddiscussionSummary2021/9/183全国第四届重味物理和CP破坏研讨会FSIscanprovideanapproachtosolvemanypuzzles.Tobeself-consistent,agoodapproachshouldalsoacc
3、ommodatewiththedataforotherchannels.Motivation2021/9/184全国第四届重味物理和CP破坏研讨会MotivationisapureannihilationprocessandtheamplitudeistotallyfromFSIs.Thisprocessisquitehelpfultodetectthedynamicsofstronginteractions.2021/9/185全国第四届重味物理和CP破坏研讨会FromtheaccumulateddataatBfactoriesandCLEO,therea
4、remanyindicationsthatFSIsmayplayaprominentrole.Itisnonperturbativeinnature.However,FSIscanbemodeledasthesoftrescatteringofcertainintermediatetwo-bodyhadronicchannelssothattheycanbetreatedasone-particle-exchangegraphs.FrameworkofFSIs2021/9/186全国第四届重味物理和CP破坏研讨会FrameworkofFSIsInordert
5、oavoidthedoublecountingproblem,weusetheleadingorderWilsoncoefficientsfortheeffectiveoperators.Weusenaïvefactorizationfordirect(shortdistance)contribution:2021/9/187全国第四届重味物理和CP破坏研讨会Atthequarklevel,finalstaterescatteringcanoccurthroughquarkannihilationandquarkexchange：FrameworkofFSI
6、s2021/9/188全国第四届重味物理和CP破坏研讨会Athadronlevel,thatiss-channelandt-channelrescattering:DuetothelackoftheexistenceofresonancesatenergiesclosetoBmesonmass,thes-channelcontributionissuppressedrelativetotherescatteringeffectfromquarkexchange.FrameworkofFSIs2021/9/189全国第四届重味物理和CP破坏研讨会Framewo
7、rkofFSIsUsingcuttingrule,wecangettheabsportivepartofthemagnitude:2021/9/1810全国第四届重味物理和CP破坏研讨会FrameworkofFSIsBecausethet-channelexchangedparticleisnotonshell,aform-factorcutoffmustbeintroducedtothevertexwhichisusuallyparametrizedas:wheren=1ispreferredandTheparameterdependsnotonlyont
8、heexchangedparticlebutalso
