摘要
在相对论重离子碰撞中寻找手征磁效应(CME)有助于人们理解强相互作用中的CP对称性破缺和量子色动力学(QCD)真空的拓扑性质。基于CME的背景和信号相对于旁观者平面和参与者平面有不同的相关性,实验上提出了一种双平面方法提取CME信号。利用具有不同强度CME的多相输运模型,在质心碰撞能量为200 GeV的同质异位素碰撞中重新探讨双平面方法,发现相对于两个不同平面的CME信号和背景效应的比值系数是不同的,这与目前实验测量中的假设不一致。这种差异来自于相对于旁观者和参与者平面的CME的退关联,它源于末态的相互作用。本工作的研究表明,目前的实验测量可能高估了在相对论性重离子碰撞中观测到的末态CME信号的比例。
The search for chiral magnetic effects(CME)in relativistic heavy-ion collisions helps us to understand CP symmetry breaking in strong interactions and the topological nature of the quantum chromodynamic(QCD)vacuum.A two-plane method was proposed based on the fact that the background and signal of CME have different correlations relative to the spectator plane and the participant plane.Using a multiphase transport model with different input strengths of CME,we revisit the two-plane method in isobar collisions at √S_(NN)=200 GeV.The relative correlations of the CME signal and background to two different planes were found to be different,which is inconsistent with the assumptions made in the current experimental measurements.The difference arises from the decorrelation of the CME relative to the spectator and participant planes,which originates from the final state interactions.Our finding suggests that the current experimental measurements may overestimate the fraction of the CME signal in the final state in relativistic heavy-ion collisions.
作者
陈帮祥
赵新丽
马国亮
CHEN Bangxiang;ZHAO Xinli;MA Guoliang(Key Laboratory of Nuclear Physics and Ion-beam Application(MOE),Institute of Modern Physics,Fudan University,Shanghai 200433,China;Shanghai Research Center for Theoretical Nuclear Physics,NSFC and Fudan University,Shanghai 200438,China;College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《原子核物理评论》
CAS
CSCD
北大核心
2024年第1期573-579,共7页
Nuclear Physics Review
基金
国家自然科学基金资助项目(12325507,12147101,11890714,11835002,11961131011,11421505,12105054)
国家重点研发计划(2022YFA1604900)
中国科学院战略优先研究计划(XDB34030000)
广东省基础与应用基础研究重大项目(2020B0301030008)。
