Pseudorapidity dependence of short-range correlations from a multi-phase transport model  

作　　者：王美娟 陈刚 马国亮 吴元芳 

机构地区：[1]Physics Department,China University of Geoscience [2]Shanghai Institute of Applied Physics,Chinese Academy of Sciences [3]Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics,Central China Normal University

出　　处：《Chinese Physics C》2016年第3期85-89,共5页中国物理C（英文版）

基　　金：Supported by GBL31512;Major State Basic Research Devolopment Program of China(2014CB845402);NSFC(11475149,11175232,11375251,11421505,11221504)

摘　　要：Using a multi-phase transport model（AMPT） that includes both initial partonic and hadronic interactions, we study neighboring bin multiplicity correlations as a function of pseudorapidity in Au＋Au collisions at √sNN= 7.7- 62.4 GeV.It is observed that for √sNN〈19.6 GeV Au＋Au collisions, the short-range correlations of final particles have a trough at central pseudorapidity, while for √sNN 〉19.6 GeV AuAu collisions,the short-range correlations of final particles have a peak at central pseudorapidity. Our findings indicate that the pseudorapidity dependence of short-range correlations should contain some new physical information, and are not a simple result of the pseudorapidity distribution of final particles. The AMPT results with and without hadronic scattering are compared. It is found that hadron scattering can only increase the short-range correlations to some level, but is not responsible for the different correlation shapes for different energies. Further study shows that the different pseudorapidity dependence of short-range correlations are mainly due to partonic evolution and the following hadronization scheme.Using a multi-phase transport model（AMPT） that includes both initial partonic and hadronic interactions, we study neighboring bin multiplicity correlations as a function of pseudorapidity in Au＋Au collisions at √sNN= 7.7- 62.4 GeV.It is observed that for √sNN〈19.6 GeV Au＋Au collisions, the short-range correlations of final particles have a trough at central pseudorapidity, while for √sNN 〉19.6 GeV AuAu collisions,the short-range correlations of final particles have a peak at central pseudorapidity. Our findings indicate that the pseudorapidity dependence of short-range correlations should contain some new physical information, and are not a simple result of the pseudorapidity distribution of final particles. The AMPT results with and without hadronic scattering are compared. It is found that hadron scattering can only increase the short-range correlations to some level, but is not responsible for the different correlation shapes for different energies. Further study shows that the different pseudorapidity dependence of short-range correlations are mainly due to partonic evolution and the following hadronization scheme.

关 键 词：short-range correlations hadronic interaction partonic evolution hadronization scheme 

分 类 号：O571.6[理学—粒子物理与原子核物理]