What is Initial State of Scattering at Finite Temperature?  

作　　者：HOU De-fu ZUO Jian LI Jia-rong 侯德富;左健;李家荣(Institute of Particle Physics,Huazhong Normal University,Wuhan 430079)

机构地区：[1]Institute of Particle Physics,Huazhong Normal University,Wuhan 430079

出　　处：《Chinese Physics Letters》1999年第5期336-338,共3页中国物理快报（英文版）

基　　金：Supported in part by the National Natural Science Foundation of China under Grand No.19775017.

摘　　要：This letter addresses a problem concerning temperature corrections to the scattering processes.Although former studies had given the temperature-dependent phase space factors in the corrections,how to derive them from the first principles was not clear.In this letter,we consider this question within the formalism of thermal field dynamics.We find that if the initial and final states in scattering processes at finite temperature are constructed from the expanded vacuum states,the scattering rate in medium can be derived with the desired temperature-dependent phase space factors.

关 键 词：dynamics. LETTER CORRECTION 

分 类 号：O57[理学—粒子物理与原子核物理]