Effects of nuclear charge fluctuations on dilepton photoproduction

作     者：Guansong Li Kai Zhou Baoyi Chen Guansong Li;Kai Zhou;Baoyi Chen

作者机构：Department of PhysicsTianjin UniversityTianjin 300350China Frankfurt Institute for Advanced StudiesRuth-Moufang-Straβe 1D-60438 Frankfurt am MainGermany Institut für Theoretische PhysikGoethe-Universitat FrankfurtMax-von-Laue-Str.1D-60438 Frankfurt am MainGermany 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2020年第72卷第2期

页      面：60-64页

核心收录：

学科分类：08[工学] 0827[工学-核科学与技术] 082701[工学-核能科学与工程] 

基　　金：supported by NSFC Grant No.11705125,11547043 the Sino-Germany(CSC-DAAD)Postdoc Scholarship support by the AI grant of SAMSON AG,Frankfurt 

主　　题：heavy ion collisions photoproduction quark gluon plasma 

摘      要：Fluctuations of dilepton production from two photon interactionsγγ→l^+l^-are studied in semicentral and peripheral nuclear *** on the Weizsacker-Williams approach,electromagnetic(EM)fields generated by moving nuclear charges are approximated as quasi-real *** fluctuating EM fields in each collision event are hard to be measured directly in experiments due to its short lifetime,we study the dilepton photoproduction with fluctuating EM fields,which are crucial for the EM fields induced chiral and charged particle evolutions,and calculate the relative standard deviation of the dilepton mass spectrum with the event-by-event fluctuating nuclear charge *** fluctuation effect becomes smaller in more peripheral collisions where the shift of proton positions is implicit for EM fields outside the *** uncertainty of effective impact parameter△b on the standard deviation is also studied,and its effect is around one-third of the effect of nuclear charge fluctuations when△b is taken as^1 fm.