Jψ粒子衰变中σ、κ粒子的研究.ppt

SingaandkappaanalysesatBESIINingWuInstituteofHighEnergyPhysics,CASBeijing,ChinaJanuary25-26,2007IntroductionTheexistenceofand=0S-,-analysisofππ/πKscatteringdatasupporttheexistenceoftheand,mostevidencesoftheexistenceofefromππ/andparticlesexist,and(2)/ψdatasample,,alowmassenhancementinππspectruminJ/ψωππandalowmassenhancementinKπspectruminJ/ψK*(892),weneednotonlytomeasuretheirpolepositions,heirspin-,(3),widthandbranchingratioofaresonance,andtodetermineitsspin-,wediscussPWAanalysesofJ/ψωππandJ/ψK*(892)K.MaincontentsofthetalkareHelicityFormalismMaximumLikelihoodMethodPWAanalysisonJ/ψωππPWAanalysisonψ′ππJ/ψPWAanalysisonJ/ψK*(892)KSummaryHelicityFormalismForatwo-bodydecayprocess ab+c spin Jsbsc momentum papbpc helicity mλbλc parity a b cItsS-matrixelementisReltivemomentumoftwofinalstateparticlesincenterofmasssyetemHelicityFormalism(2)ThedecayamplitudeisD-functionHelicitycouplingamplitudeAllangularinformationofthedecayvertexarecontainedintheD-function,(3)InJ/ψhadronicorradiativedecayprocesses,