期刊论文

中文

华中师范大学学报(自然科学版)

1000-1190

2002

36

2

155-160

10.19603/j.cnki.1000-1190.2002.02.007

The research was supported in part by National Natural Science Foundation of China（1 9975 0 1 8,1 9775 0 1 8）；

本校为第一机构

采用一种新的强相互作用模型--NEXUS产生器产生数据,研究了质心系能量s NN=200 GeV 时Au+Au碰撞下的质子-反质子产额比,讨论了不同横动量和快度区间内产额比对碰撞对心度的依赖性.发现中心快度区的质子-反质子产额比不明显依赖于碰撞对心度、横动量和快度;对于快度和横动量在|y|＜1.0 和 pt＜1. 0 GeV条件下的最小无偏碰撞事件中,NEXUS模型的质子-反质子产额比为0.943±0.002 (stat.).

This paper studies the mid-rapidity anti-proton to proton ratio in Au + Au collisions at (S_(NN))~(1/2) = 200 GeV. The data is generated with NEXUS model, which is a new hadronic interaction model. The dependenced of the ratio on centrality is presented within different regions of transverse momentum and rapidity. As a result, there is no strong centrality dependence for the mid-rapidity ratio. The p-bar/p ratio in the range of mid-rapidity is independent of either transverse momentum or rapidity. The average mid-rapidity ratio in this model is...