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重离子碰撞中双部分子散射的动量分数和硬标度依赖性

Momentum fraction and hard scale dependence of double parton scattering in heavy-ion collisions

Universidade Federal de Santa Catarina(圣卡塔琳娜联邦大学)

Joao Vitor C. Lovato, Edgar Huayra, Emmanuel G. de Oliveira

AI总结:

研究重离子碰撞中双部分子散射的动量分数和硬标度依赖性,考虑核效应(阴影和反阴影),提出新的核横向分布,计算有效截面并与pPb数据吻合,预言LHC测量结果。

摘要:

在先前的工作中,我们研究了质子-质子碰撞中双部分子散射(DPS)的动量分数和硬标度依赖性,以及由此产生的有效截面对末态可观测量依赖性。在本文中,我们将这些结果扩展到重离子($pA$和$AA$)碰撞,考虑了相关运动学区域中的核效应,即阴影和反阴影。除了修改纵向部分子分布外,这些效应还改变了原子核的横向部分子分布,为此我们提出了一种简单的新核轮廓。我们进一步假设束缚核子内的部分子比自由质子中的部分子分离得更远。我们计算了现有$p$Pb数据的有效截面,获得了合理的一致性,并为未来在LHC的测量提供了预言。我们的预言对末态的依赖性表明,重离子碰撞中的DPS可用于探测自由质子和束缚核子的横向轮廓(主要在$pA$碰撞中),以及原子核的横向结构(主要在$AA$碰撞中)。

英文摘要:

In a previous work, we studied the momentum fraction and hard--scale dependence of double parton scattering (DPS) in proton--proton collisions and the resulting dependence of the effective cross section on the final--state observables. In this paper, we extend those results to heavy--ion ($pA$ and $AA$) collisions, accounting for nuclear effects in the relevant kinematic region, namely shadowing and antishadowing. In addition to modifying the longitudinal parton distributions, these effects also alter the transverse parton distribution of the nucleus, for which we propose a simple new nuclear profile. We further hypothesize that partons inside a bound nucleon are more widely separated than in a free proton. We compute the effective cross section for the available $p$Pb data, obtaining reasonable agreement, and provide predictions for future measurements at the LHC. The observed dependence of our predictions on the final state indicates that DPS in heavy--ion collisions can be used to probe the transverse profile of the free proton and the bound nucleon, primarily in $pA$ collisions, as well as the transverse structure of the nucleus, mainly in $AA$ collisions.

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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