修正的Landau流体力学模型与Cu+Cu碰撞末态带电粒子赝快度分布  

Revised Landau Hydrodynamic Model and Pseudorapidity Distributions of Final Charged Particles in Cu+Cu Collisions

作　　者：姜志进[1] 李庆广[1] 张海利[1] 

机构地区：[1]上海理工大学理学院,上海200093

出　　处：《原子核物理评论》2013年第1期26-31,共6页Nuclear Physics Review

基　　金：上海市宝山区科学技术转化项目(CXY-2012-25);上海市一流学科项目(XTKX2012)~~

摘　　要：采用修正的Landau流体力学模型,并考虑到带头粒子效应,对高能重离子碰撞末态带电粒子的赝快度分布进行了讨论。指出:带头粒子的快度分布应为高斯形式,其正规化常数为参与者数。研究表明:流体力学模型本身与BNL-RHIC-PHOBOS合作组在√sNN=200 GeV的Cu+Cu碰撞中的实验测量符合得不是很好,只有将参与者的贡献包括在内,实验结果才能得到很好的描述。By using the revised Landau hydrodynamic model and taking into account the effect of leading particles, we discussed the pseudorapidity distributions of final charged particles in high energy heavy ion collisions. We argued that the rapidity distributions of leading particles have the Gaussian form with the normalization constant being equal to the number of participants. The investigations show that the results from the hydrodynamic model alone are not consistent with the experimental data carried out by BNL-RHIC-PHOBOS Collaboration in Cu＋Cu collisions at SNN=200 GeV. Only after the contributions from leading particles are included, can the experimental measurements be described well.

关 键 词：修正的Landau流体力学模型 带头粒子 高斯分布 

分 类 号：O572.2[理学—粒子物理与原子核物理]