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arXiv 1407.8533nucl-thhep-phnucl-ex
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相对论重离子碰撞中的逐事件直接光子各向异性流

Event-by-event direct photon anisotropic flow in relativistic heavy-ion collisions

Chun Shen, Jean-Francois Paquet, Jia Liu, Gabriel Denicol, Ulrich Heinz, Charles Gale

摘要:

我们考虑直接发射和强子衰变光子从事件的流体动力学模拟。我们计算了直接光子各向异性流系数,并与最近的实验测量结果进行了比较。我们发现,它是至关重要的,包括光子多重性作为一个加权因子的定义中的$v^γ_n$。我们还研究了直接光子谱和椭圆流对夸克-强子过渡区光子发射率的理论不确定性和相对论性重离子碰撞的预平衡动力学的敏感性。

英文摘要:

We consider directly emitted and hadronic decay photons from event-by-event hydrodynamic simulations. We compute the direct photon anisotropic flow coefficients and compare with recent experimental measurements. We find that it is crucial to include the photon multiplicity as a weighting factor in the definition of $v^γ_n$. We also investigate the sensitivity of the direct photon spectrum and elliptic flow to the theoretical uncertainty of the photon emission rate in the quark-hadron transition region and to the pre-equilibrium dynamics of relativistic heavy-ion collisions.

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