有限温度QED中的轫致辐射修正  

Bremsstrahlung Radiative Correction in QED at Finite Temperature

作　　者：肖珺[1] 王恩科[1] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079

出　　处：《高能物理与核物理》2001年第8期772-779,共8页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 ( 1 994 50 0 1 ;1 992 851 1 )资助&&

摘　　要：用有限温度场论方法 ,通过计算费曼图分析了在QED中由于温度效应导致的新红外发散 .结果表明零温场论中的红外发散和由温度效应引起的红外发散可以用描写虚过程的费曼图同时消除 .计算了轫致辐射中光子的辐射几率 ,在Eikonal近似下所得到的结果和半经典近似给出的结果一致 .Based fully on the finite temperature field theory, we calculate the Feynman diagram to analyse the new infrared divergence caused by the temperature effect in the bremsstrahlung process. It turns out that both of the infrared divergence at the zero and finite temperature can be cancelled by the identical Feynman diagram of virtual processes. We derive the probability of radiating a net energy ω in bremsstrahlung processes and the result in Eikonal approximation is the same as that obtained in the semi-classical approximation.

关 键 词：QED 有限温度场论 轫致辐射 红外发散 高能重离子碰撞 

分 类 号：O571[理学—粒子物理与原子核物理]