在RHIC和LHC中光子-核子碰撞产生的大横动量双轻子  

Large Transverse Momentum Dilepton Production from the Photon-nucleon Collisions at RHIC and LHC

作　　者：傅永平 杨海涛[2] 余功明 FU Yongping;YANG Haitao;YU Gongming(Department of Physics,West Yunnan University,Lincang 677000,Yunnan,China;Department of Physics,Zhaotong University,Zhaotong 657000,Yunnan,China;CAS Key Laboratory of High Precision Nuclear Spectroscopy and Center for Nuclear Matter Science,Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Institute for Nuclear Theory,University of Washington,Seattle,WA 98195,USA)

机构地区：[1]滇西科技师范学院物理系,云南临沧677000 [2]昭通学院物理系,云南昭通657000 [3]中国科学院近代物理研究所,中国科学院高精密核光谱学重点实验室和核物质科学中心,兰州730000 [4]华盛顿大学核理论研究所,美国华盛顿州西雅图市98195

出　　处：《原子核物理评论》2020年第2期166-171,共6页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11805029,11847207);云南省中青年学术和技术带头人后备人才培养计划资助项目(2019HB056);云南省基础研究计划资助项目(2017FD250);中国国际博士后交流奖学金资助项目(20180010);中国博士后科学基金资助项目(2017M610663)。

摘　　要：研究了RHIC和LHC能区的Au-Au和Pb-Pb周边重离子碰撞中,来自光子-核子相互作用产生的大横动量双轻子。利用微扰QCD参数化和Weizs?cker-Williams近似计算了双轻子的产率。经过与领头阶和碎裂过程的双轻子产生数值计算结果相比较,光-核碰撞过程产生的大横动量双轻子在RHIC能区是可忽略的。但是在LHC能区,光-核碰撞在大横动量区域是周边重离子碰撞的一个重要的双轻子源。We study the large transverse momentum dilepton produced by the photon-nucleon interactions in the peripheral Au-Au collisions at RHIC and Pb-Pb collisions at LHC.We calculate the dilepton production yield by using the perturbative QCD factorization approach and the Weizs?cker-Williams approximation.The numerical results indicate that the photon-nucleon collision processes is negligible by comparing with the conventional large transverse momentum dilepton production at RHIC energies.However,in the large transverse momentum region,the photon-nucleon collision could be an important large transverse momentum dilepton source in the peripheral heavy ion collisions at LHC.

关 键 词：相对论重离子碰撞 光子-核子碰撞 大横动量双轻子 

分 类 号：O572.2[理学—粒子物理与原子核物理]