相对论重离子碰撞中光子-光子相互作用的碰撞参数依赖性  

Impact parameter dependence of photon-photon interactions in relativistic heavy-ion collisions

作　　者：杨帅 唐泽波 杨驰 查王妹 Yang Shuai;Tang Ze-Bo;Yang Chi;Zha Wang-Mei(Key Laboratory of Atomic and Subatomic Structure and Quantum Control(Ministry of Education),Institute of Quantum Matter,South China Normal University,Guangzhou 510006,China;State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China;Key Laboratory of Particle Physics and Particle Irradiation,Ministry of Education,Institute of Frontier and Interdisciplinary Science,Shandong University,Qingdao 266237,China)

机构地区：[1]华南师范大学量子物质研究院,原子亚原子结构与量子调控教育部重点实验室,广州510006 [2]中国科学技术大学,核探测与核电子学国家重点实验室,合肥230026 [3]山东大学前沿交叉科学青岛研究院,粒子物理与粒子辐照教育部重点实验室,青岛266237

出　　处：《物理学报》2023年第20期36-44,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11890713,12005220,12075139,12175223,12275091);广东省基础与应用基础研究基金自然科学基金(批准号:2020B0301030008,2023A1515010416)资助的课题.

摘　　要：在相对论重离子碰撞中,接近光速的重离子产生的超强电磁场,由于洛伦兹收缩效应可等效为线性极化的准实光子,进而诱发光子-光子相互作用产生正负轻子对.相对论重离子对撞机RHIC和大型强子对撞机LHC上的国际合作实验在非超周边重离子碰撞中观测到相干光致产生过程,发现正负轻子对的横动量分布相比于其在超周边碰撞发生显著的展宽,为研究解禁闭物质--夸克胶子等离子体的电磁性质提供了新途径.本文主要回顾相对论重离子碰撞中光子-光子相互作用对碰撞参数依赖的实验研究,并讨论其在侦测夸克胶子等离子体电磁性质方面的重要意义.The Lorentz-boosted electromagnetic fields surrounding relativistic heavy ions with large charges can be treated as a flux of linearly polarized quasireal photons,which can interact via the photon-photon scattering to produce lepton antilepton pairs.Those photon-photon interactions can happen even in heavy-ion collisions with hadronic overlap,making an opportunity to probe the electromagnetic properties of the produced deconfined quark-gluon plasma.In this paper,we review the recent experimental progress of the impact parameter dependent photon-photon interactions in heavy-ion collisions,and discuss their essential role in probing the possible electromagnetic properties of quark-gluon plasma produced in hadronic heavy-ion collisions.

关 键 词：相对论重离子碰撞 夸克胶子等离子体 光子-光子相互作用 前向中子标定 双轻子 

分 类 号：O571.6[理学—粒子物理与原子核物理]