Centrality Bin Size Dependence of Multiplicity Correlation in Central Au+Au Collisions at (s_(NN))^(1/2)=200GeV  

作　　者：YAN Yu-liang ZHOU Dai-mei DONG Bao-guo LI Xiao-mei MA Hai-liang SA Ben-hao 

机构地区：[1]不详 [2]Institute of Particle Physics, Huazhong Normal University

出　　处：《Annual Report of China Institute of Atomic Energy》2009年第1期158-159,共2页中国原子能科学研究院年报（英文版）

摘　　要：We have studied the centrality bin size dependence of charged particle forward-backward multiplicity correlation strength in 5%,0-5%,and 0-10% most central Au+Au collisions at s_(NN)～(1/2)=200 GeV withWe have studied the centrality bin size dependence of charged particle forward-backward multiplicity correlation strength in 5%, 0-5%, and 0-10% most central Au＋Au collisions at √SNN =200 GeV with a parton and hadron cascade model, PACIAE based on PYTHIA. The PACIAE model is composed of four stages： parton initialization, parton evolution （rescattering）, hadronization, and hadron evolution （rescattering）. The real （total）, statistical, and negative binomial distribution （NBD） correlation strengths are calculated by the real events, the mixed events, and fitting the charged particle multiplicity distribution to the NBD, respectively. It turned out that the correlation strength increases with increasing centrality bin size monotonously. If the discrepancy between real （total） and statistical correlation strengths is identified as dynamical one, the dynamical correlation may just be a few percent of the total （real） correlation.

关 键 词：多重数分布 关联强度 碰撞 AU 部分子演化 统计相关性 金 带电粒子 

分 类 号：O571.4[理学—粒子物理与原子核物理] Q61[理学—物理]