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arXiv 2107.13239nucl-thhep-ph
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超周边超相对论重离子碰撞中低横动量电子和正电子与重核的电磁相互作用

Electromagnetic interaction of low transverse momentum electrons and positrons with heavy nuclei in ultra-peripheral ultra-relativistic heavy-ion collisions

Katarzyna Mazurek, Mariola Kłusek-Gawenda, Antoni Szczurek

摘要:

超相对论重离子碰撞中的光子-光子相互作用是产生$(e^+,e^-)$对的重要来源。光子-光子聚变导致轻子在碰撞点附近的广阔位形空间产生。在重核附近产生的电子可能与重核发生强相互作用。电子和正电子的碰撞参量空间分布的计算内的b-空间EPA模型的这种碰撞。研究了$(e^+,e^-)$与原子核的电磁相互作用引起的演化,给出了快度和横动量分布的畸变。我们首次探索的结果,在$\sqrt{s_{NN}}=$ 17.3 GeV(SPS)和200 GeV(RHIC)能量的反应Pb+Pb。我们提供了选定的创建点的结果,并在集成时,其位置所规定的$b$ -空间EPA模型。我们观察到强烈的影响,在低横动量,到目前为止没有测量的相空间的区域。特别是,我们预测一个可能相当大的积累的电子与rapidities接近的光束的速度。EM效应导致电子和正电子产生的不对称性。

英文摘要:

The photon-photon interaction in ultra-relativistic heavy-ion collision is a source of the $(e^+,e^-)$ pairs. The photon-photon fusion leads the lepton creation in the broad configuration space around "collision" point. Those created close to heavy nuclei may undergo strong interaction with them. The impact parameter space distribution of electrons and positrons are calculated within the b-space EPA model of such collisions. The evolution due to the electromagnetic interaction of $(e^+,e^-)$ with nuclei is studied, and the distortion of rapidity and transverse momentum distributions are shown. We show first exploratory results for the reaction Pb+Pb at $\sqrt{s_{NN}}=$ 17.3 GeV (SPS) and 200 GeV (RHIC) energies. We provide results for selected creation points and when integrating over their position as dictated by the $b$-space EPA model. We observe strong effects at low transverse momenta, so far not measured regions of the phase space. In particular, we predict a possible sizeable accumulation of electrons with rapidities close to the beam rapidity. The EM effects lead to asymmetry in the production of electrons and positrons.

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