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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
【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 .
【Abstract】 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.
【Key words】 relativistic nucleus-nucleus collisions； charged particle ratio； event-by-event fluctuations； hadron and string cascade model JPCIAE；
- 【文献出处】 高能物理与核物理 ,High Energh Physics and Nuclear Physics , 编辑部邮箱 ,2002年12期
- 【分类号】O571.212
- 【被引频次】4
- 【下载频次】35