强作用介质诱导的光子辐射和双轻子产生  

Induced Photon Radiation and Dilepton Production in Strong Interaction Medium

作　　者：康忠波[1] 张汉中[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》2003年第11期960-965,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金(19928511;10135030)~~

摘　　要：考察了相对论性高能重离子碰撞中产生的硬部分子喷注穿过强作用介质时,喷注与介质中的部分子多次散射诱导的光子辐射与双轻子产生,得到了对应于opacity展开第一阶的光子横动量谱,辐射光子导致的喷注的能量损失以及双轻子的不变质量谱,结果表明,光子的产生率随横动量的增加而降低,双轻子的产生率随其不变质量的增加而减小,辐射光子导致的能量损失线性依赖强作用介质靶的厚度。Photon radiation and dilepton production induced by mutiple parton rescattering are investigated when a hard parton jet produced in relativistic high energy heavy ion collision pass through strong interaction medium. We derive the transverse momentum spectrum and parton energy loss for the radiated photon, the invariant mass spectrum of dilepton. The numerical results turn out: the photon yield decreases as increasing transverse momentum, the dilepton yield decreases as increasing invariant mass. Parton energy loss due to photon radiation depends linearly on thickness of medium targets.

关 键 词：相对论性高能重离子碰撞 强作用 介质诱导 光子辐射 双轻子产生 opacity展开 不变质量谱 landau-Pomeronchuk-Migdal效应 

分 类 号：O572.3[理学—粒子物理与原子核物理]