Production of photons in relativistic heavy-ion collisions
Production of photons in relativistic heavy-ion collisions
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DOI：
10.1103/physrevc.93.044906
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发表时间：
2015-09
影响因子：
3.1
通讯作者：
J. Paquet;C. Shen;G. Denicol;M. Luzum;B. Schenke;S. Jeon;C. Gale
中科院分区：
文献类型：
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作者：
J. Paquet;C. Shen;G. Denicol;M. Luzum;B. Schenke;S. Jeon;C. Gale
在这项工作中，重离子碰撞的流体力学模型的使用，结合了最近的发展和更新的光子发射率，极大地改善了与Alice和PHENIX的直接光子测量的一致性，支持了热光子是直接光子动量各向异性的主要来源的观点。逐个事件流体动力学模型使用与撞击参数相关的玻璃体模型(IP-GLASMA)初始态，并首次包括剪切粘性和整体粘性，以及这两种粘性之间的二阶耦合。研究了剪切粘性和体粘性对光子速率的影响，结果表明，这些输运系数对光子动量各向异性有可测量的影响。
In this work it is shown that the use of a hydrodynamical model of heavy-ion collisions which incorporates recent developments, together with updated photon emission rates, greatly improves agreement with both ALICE and PHENIX measurements of direct photons, supporting the idea that thermal photons are the dominant source of direct photon momentum anisotropy. The event-by-event hydrodynamical model uses the impact parameter dependent Glasma model (IP-Glasma) initial states and includes, for the first time, both shear and bulk viscosities, along with second-order couplings between the two viscosities. The effect of both shear and bulk viscosities on the photon rates is studied, and those transport coefficients are shown to have measurable consequences on the photon momentum anisotropy.