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arXiv 2406.18673hep-phnucl-th
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磁场中的双胶子-单光子顶点及其在中等场强区域下的显式单圈近似

Two-gluon one-photon vertex in a magnetic field and its explicit one-loop approximation in the intermediate field strength regime

Alejandro Ayala, Santiago Bernal-Langarica, Jorge Jaber-Urquiza, José Jorge Medina-Serna

AI总结:

本文研究了恒定磁场中双胶子-单光子顶点的张量结构,并在中等场强区域完成单圈计算,发现光子倾向于在垂直磁场平面内传播,为正椭圆流贡献提供解释。

摘要:

我们找到了在恒定磁场存在下双胶子-单光子顶点的一般结构。我们证明,当考虑到强相互作用和电磁相互作用在宇称、电荷共轭和胶子交换下满足的对称性,并且胶子和光子都在质壳上时,只存在三种可能的张量结构来张成该顶点。这些张量结构对应于顶点中每个粒子极化矢量的外积。我们还在中等场强区域显式计算了该顶点的单圈近似,这一区域最适合用来描述在周边相对论重离子碰撞的前平衡阶段中,磁场存在对增强光子发射可能产生的影响。我们证明,光子最有利的传播方向是在垂直于磁场的平面内,这与对 $ν_2$ 的正贡献一致,并可能有助于理解在这类反应中测量到的比预期更大的椭圆流系数。

英文摘要:

We find the general structure for the two-gluon one-photon vertex in the presence of a constant magnetic field. We show that, when accounting for the symmetries satisfied by the strong and electromagnetic interactions under parity, charge conjugation and gluon interchange, and for gluons and photons on mass-shell, there exist only three possible tensor structures that span the vertex. These correspond to external products of the polarization vectors for each of the particles in the vertex. We also explicitly compute the one-loop approximation to this vertex in the intermediate field strength regime, which is the most appropriate one to describe possible effects of the presence of a magnetic field to enhance photon emission during pre-equilibrium in peripheral relativistic heavy-ion collisions. We show that the most favored direction for the photon to propagate is in the plane transverse to the field, which is consistent with a positive contribution to $ν_2$ and may help to understand the larger than expected elliptic flow coefficient measured in this kind of reactions.

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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