利用NEXUS模型对质心系碰撞能量200 GeV的Au+Au碰撞中质子-反质子产额比的研究

摘要

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 colli sions at sNN=200 GeV. The data is generated with NEXUS model, which is a new hadronic interaction model.The dependence of the ratio on centra lity is presented within different regions of transverse momentum and rapidity. As a result, there is no strong centrality dependence for the mid-rapidity rati o. The /p ratio in the range of mid-rapidity is independent of eith er transverse momentum or rapidity. The average mid-rapidity ratio in this mod el is 0.943±0.002(stat.) for minimum bias collisions within the rapidity and transverse momentum range of |y|＜1.0 and pt＜1.0 GeV.