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arXiv 2603.24964hep-phnucl-th
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介子场诱导下重离子碰撞中光子产生机制

Photon production from gluon splitting and fusion induced by a magnetic field in heavy-ion collisions

Universidad Nacional Autónoma de México(墨西哥国立自治大学);Universidade de São Paulo(圣保罗大学);Universidade Estadual Paulista(圣保罗州立大学);Universidad del Bío-Bío(比奥比奥大学)

Alejandro Ayala, Santiago Bernal-Langarica, José Jorge Medina-Serna, Ana Julia Mizher

AI总结:

研究强场中胶子分裂与融合对光子产生贡献,发现低能光子中分裂主导融合,实验数据与PHENIX结果对比,考虑纵向各向异性对光子产量影响不显著。

摘要:

在重离子碰撞中,观测到光子产量异常增加及正椭圆流异常增大,称为直接光子谜题。本文研究强场下预平衡阶段胶子分裂与融合产生光子的机制。通过分析双胶子单光子顶点的张量结构,计算其一阶修正,发现低能光子中分裂贡献大于融合。结果与PHENIX实验数据对比,并考虑初始胶子分布的纵向各向异性,发现其对光子产量影响不显著。

英文摘要:

In heavy-ion collisions, an excess in photon production, together with a larger than expected positive elliptic flow, has been observed, a phenomenon commonly referred to as the direct photon puzzle. In this work we study the mechanism of photon production arising from gluon splitting and fusion during the pre-equilibrium stage in the presence of magnetic fields in peripheral heavy-ion collisions. We begin by analyzing the general tensor structure of the two-gluon one-photon vertex, computing it at the one-loop level for magnetic fields of arbitrary strength without resorting to additional approximations. Using these expressions, we calculate the contribution of gluon fusion and splitting to the photon yield, revealing that splitting dominates over fusion at low photon energies. Our results are compared with experimental data from the PHENIX collaboration. Finally, we incorporate a longitudinal anisotropy into the initial gluon distribution and find that it does not significantly alter the photon yield compared to an isotropic distribution.

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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