Effects of centrality fluctuation and deuteron formation on the proton number cumulant in Au+Au collisions at√SNN=3 GeV from the JAM model  

作　　者：Arghya Chatterjee Yu Zhang Hui Liu Ruiqin Wang Shu He Xiaofeng Luo Arghya Chatterjee;张宇;刘慧;王瑞琴;何澍;罗晓峰(Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China)

机构地区：[1]Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics,Central China Normal University,Wuhan 430079,China

出　　处：《Chinese Physics C》2021年第6期128-137,共10页中国物理C（英文版）

基　　金：Supported by the National Key Research and Development Program of China(2020YFE0202002,2018YFE0205201);the National Natural Science Foundation of China(11828500,11828501,11575069,11890711,11861131009)。

摘　　要：We studied the effects of centrality fluctuation and deuteron formation on the cumulant(C_(n))and correlation functions(K_(n))of protons up to the sixth order in the most central(b<3 fm)Au+Au collisions at√SNN=3 GeV in a microscopic transport model(JAM).The results are presented as a function of rapidity acceptance within the transverse momentum 0.4<p T<2 GeV/c.We compared the results obtained by the centrality bin width correction(CBWC)using charged reference particle multiplicities with the CBWC using impact parameter bins.It was found that,at low energies,the centrality resolution for determining the collision centrality using charged particle multiplicities is not sufficient to reduce the initial volume fluctuation effect for higher-order cumulant analysis.New methods need to be developed to classify events with high centrality resolution for heavy-ion collisions at low energies.Finally,we observed that the formation of deuterons suppresses the higher-order cumulants and correlation functions of protons and found it to be similar to the efficiency effect.This work can serve as a noncritical baseline for the QCD critical point search in the high baryon density region.

关 键 词：QCD critical point heavy-ion collisions quark-gluon plasma 

分 类 号：O571.6[理学—粒子物理与原子核物理]