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arXiv 2003.02947hep-phhep-exnucl-exnucl-th
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重离子碰撞中双光子过程的轻子对产生

Lepton Pair Production Through Two Photon Process in Heavy Ion Collisions

Spencer Klein, Al Mueller, Bo-Wen Xiao, Feng Yuan

摘要:

本文研究了相对论重离子碰撞中低横动量轻子对的电磁产生。我们估计的初始光子的横向动量的贡献,采用模型中的平均横向动量平方的入射光子可以计算在等效光子近似。我们进一步导出了软光子辐射的全阶QED公式,它给出了LHC超周边碰撞中ATLAS数据的一个很好的描述。对于外围和中心碰撞,额外的$p_T$加宽效应从多重相互作用的介质和磁场的贡献从夸克-胶子等离子体进行了讨论。

英文摘要:

This paper investigates the electromagnetic production of lepton pairs with low transverse momentum in relativistic heavy ion collisions. We estimate the initial photons' transverse momentum contributions by employing models where the average transverse momentum squared of the incoming photon can be calculated in the equivalent photon approximation. We further derive an all order QED resummation for the soft photon radiation, which gives an excellent description of the ATLAS data in ultra-peripheral collisions at the LHC. For peripheral and central collisions, additional $p_T$-broadening effects from multiple interaction with the medium and the magnetic field contributions from the quark-gluon plasma are also discussed.

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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