Medium temperature dependence of quark energy loss

Abstract

By using the reaction operator approach and the single hard scattering approximation scenario, we study the medium temperature dependence of heavy quark radiation energy loss via introducing the medium temperature into QCD running coupling a s and Debye mass m D . Our results indicate that there exist an equilibrum temperature T = 320 MeV in Au-Au collisions withe energy 130 GeV at RHIC, which is agreement with the prediction from hydrodynamic model. We also find that, in the low p t region, the color coupling effect dominates the heavy quark radiation energy loss, and the energy loss will be dominated by the Debye screening effect when the quark p t become large.