A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions
A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions
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DOI：
10.1088/0954-3899/36/3/035101
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发表时间：
2007-12
期刊：
影响因子：
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通讯作者：
Fuming Liu;K. Werner
中科院分区：
文献类型：
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作者：
Fuming Liu;K. Werner
我们研究了在相对论重离子对撞机（RHIC）上，在200 GeV/核子的能量下，中心Au-Au碰撞中直接光子的产生，考虑了所有可能的来源。我们对待热光子发射的夸克胶子等离子体和强子气体，基于一个现实的热力学膨胀。硬光子从基本核子散射包括：原始的基本散射肯定是占主导地位的大横动量，但也不能忽略二次光子从喷流碎裂和喷流光子转换。在这两种情况下，我们研究的能量损失的影响，我们也考虑从韧致辐射胶子通过碎裂发出的光子。
We investigate the production of direct photons in central Au-Au collisions at the relativistic Heavy-Ion Collider (RHIC) at 200 GeV per nucleon, considering all possible sources. We treat thermal photons emitted from a quark-gluon plasma and from a hadron gas, based on a realistic thermodynamic expansion. Hard photons from elementary nucleon-nucleon scatterings are included: primordial elementary scatterings are certainly dominant at large transverse momenta, but also secondary photons from jet fragmentation and jet-photon conversion cannot be ignored. In both cases we study the effect of energy loss, and we also consider photons emitted from bremsstrahlung gluons via fragmentation.