高能重离子碰撞中正负荷电粒子比单事例起伏研究  

Study of Event-by-Event Fluctuations in the Charged Particle Ratio in High Energy Heavy-Ion Collisions

作　　者：周代梅[1] 蔡勖[1] 刘志毅[2] 陆中道[2] 萨本豪[2] 

机构地区：[1]华中师范大学粒子物理研究所,武汉430079 [2]中国原子能科学研究院,北京102413

出　　处：《高能物理与核物理》2002年第12期1271-1276,共6页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金 (1 0 0 75 0 3 5 ;1 9975 0 75 )资助~~

摘　　要：用强子和弦级联模型 ,JPCIAE及相应的MonteCarlo事例产生器 ,研究相对论性核 -核碰撞中有限快度区间内正负荷电粒子比单事例起伏与能量、中心度、共振态衰变及快度间隔的关系 .JPCIAE模型能够较好地符合CERN SPS能区Pb +Pb碰撞的实验结果 .本文还用此模型预言了RHIC能区Au +Au碰撞和ALICE能区Pb +Pb碰撞中的正负荷电粒子比单事例起伏 .可以看出碰撞能量、中心度、共振态衰变及快度间隔对正负荷电粒子比单事例起伏的影响都不大 .Using a hadron and string cascade model,JPCIAE,and the corresponding Monte Carlo events generator,the behavior of the charged particle ratio event-by-event fluctuations in subsystem depending on energy,centrality,resonance decay and rapidity interval was investigated for Pb+Pb collisions at SPS and ALICE energies,and for Au+Au collisions at RHIC energies. The model results of charged particle ratio event-by-event fluctuations as a function of the rapidity interval in Pb+Pb collisions at SPS energies were comparable with the preliminary NA49 data. It turned out that the charged particle ratio fluctuation has no strong energy,centrality,resonance decay and rapidity interval dependences.

关 键 词：高能重离子碰撞 相对论性核-核碰撞 正负荷电粒子比 单事例起伏 JPCIAE模型 

分 类 号：O571.212[理学—粒子物理与原子核物理]