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arXiv 1704.02433hep-ph
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相对论重离子碰撞中磁场诱导胶子熔合的瞬发光子产额和椭圆流

Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions

Alejandro Ayala, Jorge David Castano-Yepes, C. A. Dominguez, L. A. Hernandez, Saul Hernandez-Ortiz, Maria Elena Tejeda-Yeomans

摘要:

本文计算了半中心相对论重离子碰撞中由磁场引起的非平衡胶子熔合的早期光子产生。计算结果解释了早期碰撞的主要特征,即强烈的磁场和高胶子占据数。胶子融合通道是由磁场使可能的,否则将由于电荷共轭不变性而被禁止。因此,该过程的光子产额超过了没有磁场效应的计算。我们将这种过量与PHENIX数据和最近的光子横向动量分布和椭圆流系数$v_2$的流体动力学计算之间的差异进行比较。我们发现,合理的饱和尺度和磁场强度的值,计算有助于更好地描述在RHIC能量的横向光子动量的最低部分获得的实验结果。

英文摘要:

We compute photon production at early times in semi-central relativistic heavy-ion collisions from non-equilibrium gluon fusion induced by a magnetic field. The calculation accounts for the main features of the collision at these early times, namely, the intense magnetic field and the high gluon occupation number. The gluon fusion channel is made possible by the magnetic field and would otherwise be forbidden due to charge conjugation invariance. Thus, the photon yield from this process is an excess over calculations without magnetic field effects. We compare this excess to the difference between PHENIX data and recent hydrodynamic calculations for the photon transverse momentum distribution and elliptic flow coefficient $v_2$. We show that with reasonable values for the saturation scale and magnetic field strength, the calculation helps to better describe the experimental results obtained at RHIC energies for the lowest part of the transverse photon momentum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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