The Temperature Dependence Of The Masses Of Decuplet Baryons And Light Flavor Mensons

Quantum Chromodynamics(QCD)is a quantum gauge field theory with SU(3)as the gauge group,which describes the strong interaction and has two important properties: asymptotic freedom and quark confinement.Strong interaction coupling constant is large at the hadronic scale,so perturbative approaches do not work.While in practice many experiments occur at the hadronic scale,which require us develop nonperturbative methods.QCD sum rule is a non-perturative method based on QCD first principle,and it is a powerful tool to describe the non-perturative phenomena like mass spectrum and decay properties.With the development of heavy-ion experiments,there are a lot of hot and dense matter,which initiates the interests in the investigation of the properties of the hadrons at finite temperature and density.In1986,the method of QCD sum rules were extended to the case of finite temperature by Bochkarev and Shaposhnikov.At present,with more than 20 years' development and improvement,QCD sum rules at finite temperature are extensively used to study the thermal properties of hadrons.The present works about QCD sum rules at finite temperature mainly focus on the researches of mesons,while as for baryons there are few works.Therefore,the investigation about baryons has certain theoretical significance.In the present paper,we investigate the temperature dependence of the masses of the decuplet baryons,finding that the masses keep invariant as T ? 0.11 GeV,but the masses of baryons sharply decrease with increasing temperature when T > 0.11 GeV.We also study the temperature dependence of masses of light flavor scalar mesons,light flavor pseudoscalar mesons,light flavor vector mesons and the light flavor axial vector mesons.For ?(600),?,? and a1,their masses keep as constants when the temperature is less than 0.15 GeV,0.16 GeV,0.14 GeV and 0.15 GeV,respectively.As the temperature is larger than the corresponding value,the masses decrease rapidly as temperature increasing.According to the results in the present paper,we learn that the varieties of the hadrons' masses with temperature are very similar,which means that there is a phase transition from hadrons to quark-gluon plasma in the QCD.