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1、CLNS00/1660January2000hep-ph/0001334IntroductiontoBPhysicsMatthiasNeubertNewmanLaboratoryofNuclearStudies,CornellUniversityIthaca,NewYork14853,USAAbstract:Theselecturesprovideanintroductiontovarioustopicsinheavy-
avorphysics.Wereviewthetheoryandphenom
2、enologyofheavy-quarksymmetry,exclusiveweakdecaysofBmesons,inclusivede-cayrates,andsomerareBdecays.arXiv:hep-ph/0001334v131Jan2000LecturespresentedattheTriesteSummerSchoolinParticlePhysics(PartII)Trieste,Italy,21June{9July,1999INTRODUCTIONTOBPHYSICSMAT
3、THIASNEUBERTNewmanLaboratoryofNuclearStudiesCornellUniversity,Ithaca,NY14853,USATheselecturesprovideanintroductiontovarioustopicsinheavy-
avorphysics.Wereviewthetheoryandphenomenologyofheavy-quarksymmetry,exclusiveweakdecaysofBmesons,inclusivedecayrat
4、es,andsomerareBdecays.1IntroductionTherichphenomenologyofweakdecayshasalwaysbeenasourceofinforma-tionaboutthenatureofelementaryparticleinteractions.Alongtimeago,-and-decayexperimentsrevealedthestructureofthee ective
avor-changinginteractionsatlowmome
5、ntumtransfer.Today,weakdecaysofhadronscon-tainingheavyquarksareemployedfortestsoftheStandardModelandmea-surementsofitsparameters.Inparticular,theyo erthemostdirectwaytodeterminetheweakmixingangles,totesttheunitarityoftheCabibbo-Kobayashi-Maskawa(CKM)m
6、atrix,andtoexplorethephysicsofCPviolation.Hopefully,thiswillprovidesomehintsaboutNewPhysicsbeyondtheStan-dardModel.Ontheotherhand,hadronicweakdecaysalsoserveasaprobeofthatpartofstrong-interactionphenomenologywhichisleastunderstood:thecon nementofquark
7、sandgluonsinsidehadrons.ThestructureofweakinteractionsintheStandardModelisrathersimple.Flavor-changingdecaysaremediatedbythecouplingofthechargedcurrentJtotheW-boson eld:CCgyLCC=
