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IF 1.7 4区物理与天体物理 Q2 PHYSICS, NUCLEAR

Nuclear Physics A Pub Date : 2024-09-13 DOI:10.1016/j.nuclphysa.2024.122959

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引用次数: 0

摘要

在本研究中，我们研究了超外围重离子碰撞（UPCs）中的光子-光子散射。我们首先从第一原理推导出有效拉格朗日，然后应用软共线有效理论（SCET）的因式分解技术。通过这种方法，我们可以将光子-光子散射截面分解为两个主要因素：广义横动量分布（GTMDs）和硬散射振幅。我们进一步分析了终态轻子的软光子发射，通过演化方法将软函数纳入截面。我们的分析详细预测了终态轻子之间的可观测角相关性。具体来说，我们计算了以方位角参数〈cos2ϕ〉和〈cos4ϕ〉为特征的角相关性，突出了初始光子偏振和终态软光子反冲效应的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Factorization of photon induced processes in ultra-peripheral heavy ion collisions

In this study, we investigate photon-photon scattering in ultra-peripheral heavy ion collisions (UPCs). We start by deriving an effective Lagrangian from first principles and then apply factorization techniques from Soft-Collinear effective theory (SCET). This approach allows us to decompose the photon-photon scattering cross-section into two primary factors: the generalized transverse momentum distributions (GTMDs) and the hard scattering amplitude. We further analyze the emission of soft photons by final state leptons, incorporating a soft function into the cross section through an evolution method. Our analysis yields detailed predictions for observable angular correlations among the final state leptons. Specifically, we calculate the angular correlations characterized by the azimuthal parameters $〈 \cos 2 ϕ 〉$ and $〈 \cos 4 ϕ 〉$ , highlighting the influence of initial photons polarization and recoil effects from final state soft photons.

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来源期刊

Nuclear Physics A 物理-物理：核物理

CiteScore

3.60

自引率

7.10%

发文量

113

审稿时长

61 days

期刊介绍： Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.