Physics of the Charm Quark Wayne State University Physics.ppt

physicsofthecharmquark,genegolowichphysicsdepartmentuniv.ofmassachusettsamherstmacolloquiumwaynestateuniv.september22,2005,roughoutline,somebackgroundcommentssomestandardmodelsomenewphysics,coalstonewcastle,experimentcleo:bonvicini,cinabro,dubrovincdf:harr,karchintheorypetrov,gabbiani,alfiky,discoveryofcharm,age:c-quarkwillturn31on11/11birth:eastcoast(bnl)westcoast(slac)slacmethod:narrowresonanceate=3.1gev!thereaftercalledthej/,thestandardmodel,nutevanomaly?,threeyearsoftests,spectrumofquarkmasses,predictthisspectrum:easy/hard?,quarkmassesandtheory,predictquarkmasses?noviablemodelsexistwhataboutstringtheory?stringgroundstatehuge!landscapedescription.many-universesscenario.elementaryconstantsrandom!luckyus!weexist!whataboutmc=1.3gev?difficulttheoretically.notheavyenough!notlightenough!complicationsofqcd,qedvsqcd,qedqcd,progressinlatticeqcd,standardmodelphysics,dmesongroundstatethespectatorc-quark:bcmesonsddecays:leptonic,semileptonic,nonleptonicspectroscopy:exoticstates?,dmesongroundstate,predictthestates:easy/hard?,dmesongroundstate,q=ud0q=dd+q=sds+easy!3*ofsu(3),flavoredmesons,eachquarkhasitsownflavorquarkcompositesareflavoreds-quark:ks=c-quark:ds=b-quark:bs=thet-quarkdecaystooquickly!,bcmesons!,leptonicdecayofd+,decayamplitude:decayconstantfd:non-perturbativeefect.requireslatticeqcd!,fd:theoryvsexperiment,semileptonicdecays,decayamplitude:d0ke+e,formfactorslopes,nonleptonicdecays,decayamplitude:a=aei,dalitzstudies,phaseinformation,moredalitz,comparativelifetimes,b:b-=bb0=d-/0=0.92,comparativelifetimes,b:b-=bb0=d-/0=0.92d:d0=cd+=c-/0=2.55,comparativelifetimes,b:b-=bb0=d-/0=0.92d:d0=d+=-/0=2.55k:k-=k0=-/0=139.,charmproduction,e+e-collisionsproducecharm.therearepredictionsforthis.notalldataareunderstood!,heavymesonspectroscopy,x(3872)sighting,isx(3872)amolecule?,alfiky,gabbiani,petrov(2005)plusothersinterpretx(3872)asaboundstateofhadrons()analogoustothedeuteron!similarmolecularstatepredictedlongago.beware:otherinterpretationspossible.,y(3940),2/d.o.f.=15.6/8stat.sig.=8.1,aboved*dthresholdnotfoundinddord*dfinalstates,isy(3940)ahybrid?,hybridmeson:color-octetquark-antiquarkcouplestocolor-octetgluontoyieldcolor-singlethadron,d0k-+,wherearecpviolations?,newphysicsandcharm,methodology?raredecaysofdmesonsflavoroscillationscpviolations(notdiscussedhere),methodology,howtofindnewphysics?studysystemswheresmsignalsaresmall.idealforcharm:araredecaysbflavoroscillations,d0+-inthesm,dataandd0+-,d00e+e-,flavoroscillations,mixingmixingalsoink0,bdandbs.eachoftheseisdifferent!,twocoupledpenduli,thespring,newphysicsandmixing,thenormalmodes,normalmodeseffectofcp:,cpeigenstates,mixingofbdmesons,mixingofbsmesons,mixingofkmesons,mixingofd0mesons,recentworkond0mixing,theory:effectofqcdincorporatedintoanalysisofd0mixingbygolowichandpetrov.workcontinues.experiment;especiallyinterestingareattemptstomeasuredatthe1%level.,summaryi,thec-quarkisaremarkablyspry31yearold!averyactivesociallife:spectroscopyflavoroscillationsraredecayscpviolationsearchesafterstudiesatcdf,cleo,belleandbabarwillcomethelongawaitedl