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

Study anti-proton to proton ratio from Au+Au collisions at s_(NN)～(1/2)=200 GeV in NEXUS model

作　　者：李会红[1] 刘复明[1] 刘峰[1] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079

出　　处：《华中师范大学学报（自然科学版）》2002年第2期155-160,共6页Journal of Central China Normal University：Natural Sciences

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

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 N N =2 0 0 Ge V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 Ge V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 .0 0 2 ( stat.) .This paper studies the mid rapidity anti proton to proton ratio in Au+Au collisions at sNN = 200 GeV. The data is generated with NEXUS model, which is a new hadronic interaction model.The dependence 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 ratio in the range of mid rapidity is independent of either transverse momentum or rapidity. The average mid rapidity ratio in this model is 0.943±0.002 (stat .) for minimum bias collisions within the rapidity and transverse momentum range of |y|<1.0 and p t<1.0 GeV.

关 键 词：NEXUS模型 质心系 碰撞 能量 质子-反质子产额比 对心度 

分 类 号：O571.422[理学—粒子物理与原子核物理] O572.243[理学—物理]