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1、MediaEffect onPentaquark郝学文From清华大学物理系Incorporationwith庄鹏飞，黄旭光Outline1.Motivations2.Method(1)3.Results(1)4.Conclusions(1)5.Method(2)6.Results(2)7.Conclusions(2)8.Outlook2005-7-12LanZhouMotivationsKnown:M=1540MeV,<25MeV,B=+1,S=+1,Q=+1Decaychannels:Unknown:Spin,I
2、sospin,ParityQuestions:Howtodetermineitsparity?CanitbeformedeasilyinHeavyIonCollisions?CantheTemperatureandDensityEffectshelpustosolvethesequestions?2005-7-13LanZhouTwopartsOurworkincludestwoparts:1,EffectofChiralSymmetryRestorationonPentaquark$Theta^+$MassandW
3、idthatFiniteTemperatureandDensity;PLB607(2005)78-86Huang,Hao,Zhuang2,Photoproductionofpentaquark$Theta^+$ andchiralsymmetryrestorationinhotanddensemediumalmostfinished2005-7-14LanZhouMethod----LagrangiansTheeffectiveLagrangiansforthePseudoVector(PV)andPseudoScal
4、ar(PS)$NThetaK$couplingsare(Nametal,PLB579(2004)43):ThisisfortheP=+1,remove$igamma_5$togettheLforP=-1.2005-7-15LanZhouCouplingconstantsThecouplingconstants$g_A^*$and$g$canbeobtainedbyfixingthemass$M_{Theta}=1540MeV$anddecaywidth$Gamma_{Theta}=15MeV$inthevac
5、uum.2005-7-16LanZhouPropagator&Self-EnergyThepropagatorcanbewrittenaswithThelowestorderof$Theta^+$self-energycanbeshowninthefollowingfigure:and,whereμisthebaryonchemicalpotential.2005-7-17LanZhouPoleEquationThecomplexmasscanbedeterminedfromthepoleequation:Inthe
6、restframeof$Theta^+$,wewillget2005-7-18LanZhouChiralsymmetrySpontaneouschiralsymmetrybreakinganditsrestorationinhotanddensemediumdominatesanyhadronsystem.Chiraldynamicsinfullyreflectedinnucleonmass$M_N$.NJLcandescribechiraldynamicswell2005-7-19LanZhouResultof$M
7、_N$Thefollowingfiguresgivetheeffectivenucleonmassasthefunctionoftemperatureandbaryonchemicalpotential.2005-7-110LanZhouResult(1)Herewegivethetemperaturedependenceof$M_{Theta^+}$at$mu=0,1GeV$.2005-7-111LanZhouResult(2)Herewegivethechemicalpotentialdependenceof$
8、M_{Theta^+}$at$T=0,200MeV$.2005-7-112LanZhouResults(3)TemperaturedependenceofthemediummodificationtoTheta+width:2005-7-113LanZhouResults(4)Chemicalpotentialdependenc
