相对论重离子擦边对撞中相干光致产生过程  

Coherent photoproduction processes in hadronic heavy-ion collisions

作　　者：罗加宣 吴鑫 周健[1,2] 查王妹 唐泽波 Jiaxuan Luo;Xin Wu;Jian Zhou;Wangmei Zha;Zebo Tang(State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026,China;Department of Modern Physics,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]核探测与核电子学国家重点实验室,中国科学技术大学,安徽合肥230026 [2]中国科学技术大学近代物理系,安徽合肥230026

出　　处：《中国科学技术大学学报》2022年第6期23-38,I0002,共17页JUSTC

基　　金：supported by the National Natural Science Foundation of China (11775213, 12005220);the USTC Research Funds of the Double First-Class Initiative(YD2360002001)。

摘　　要：STAR、ALICE和ATLAS合作组最近在相对论重离子擦边对撞中观测到了J/ψ和双轻子的产额在极低横动量下存在显著的反常增强。考虑了冷核物质效应和热核物质效应的强子产生无法解释这种增强,而考虑了核重叠区域的相干光致产生的计算结果可以很好地描述实验数据。这些实验和理论结果表明在相对论重离子擦边对撞中存在相干光致产生过程,为我们探测夸克胶子等离子体提供了新的探针。本文回顾和总结了近些年来擦边重离子对撞中相干光致产生的实验和理论研究进展。Recently, significant abnormal enhancements in J/ψ and dilepton production have been observed in peripheral heavy-ion collisions at very low transverse momentum by the STAR, ALICE and ATLAS Collaborations. The observed excesses cannot be explained by hadronic production combined with the cold and hot medium effects, though it can be well described by coherent photoproduction calculations with nuclear overlap. These experimental and theoretical results provide evidence of coherent photoproduction in hadronic heavy-ion collisions, which suggest novel probes for detecting the properties of quark-gluon plasma(QGP). In this work, we review recent experimental and theoretical progress regarding coherent photoproduction in hadronic heavy-ion collisions.

关 键 词：擦边重离子对撞 夸克-胶子等离子体 相干光致产生 J/ψ 双轻子 

分 类 号：O571.6[理学—粒子物理与原子核物理]