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arXiv 1108.2131hep-phnucl-exnucl-th
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相对论重离子对撞机上的热光子和集体流

Thermal Photons and Collective Flow at the Relativistic Heavy-Ion Collider

H. van Hees, C. Gale, R. Rapp

摘要:

更新了相对论重离子对撞机(RHIC)核碰撞中热光子产生的计算。具体来说,我们解决了最近的实验观察到的椭圆形流的直接光子的大小与π介子,这是在差异与预期的基础上夸克-胶子等离子体(QGP)占主导地位的光子辐射。我们的热发射率是基于以前的工作,即,图中给出了约束相中的前导阶QGP发射和介质中强子速率。这些速率在接近预期QCD相变的温度下几乎退化。率卷积在一个改进的椭圆火球膨胀与横向和椭圆流场定量约束的经验轻和奇怪的强子谱。中心Au-Au碰撞产生的直接光子谱的特点是强子主导的发射高达2-3 GeV的横动量。在强子阶段相关联的大椭圆流减轻了与QGP为主的发射的情况下,测量的光子-V2的差异。

英文摘要:

We update our calculations of thermal-photon production in nuclear collisions at the Relativistic Heavy-Ion Collider (RHIC). Specifically, we address the recent experimental observation of an elliptic flow of direct photons comparable in magnitude to that of pions, which is at variance with expectations based on quark-gluon plasma (QGP) dominated photon radiation. Our thermal emission rate is based on previous work, i.e., resummed leading-order QGP emission and in-medium hadronic rates in the confined phase. These rates are nearly degenerate at temperatures close to the expected QCD-phase change. The rates are convoluted over an improved elliptic-fireball expansion with transverse- and elliptic-flow fields quantitatively constrained by empirical light- and strange-hadron spectra. The resulting direct-photon spectra in central Au-Au collisions are characterized by hadron-dominated emission up to transverse momenta of ~2-3 GeV. The associated large elliptic flow in the hadronic phase mitigates the discrepancy with the measured photon-v2 compared to scenarios with QGP-dominated emission.

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