200 GeV下Au-Au碰撞中末态粒子横动量分布的标度函数研究  

Transverse Momentum Distributions of Final-state Particles Produced in Au-Au Collisionsat (S_(NN))^(1/2)=200GeV:A Study by Index Function

作　　者：唐帅 卫华荣 洪碧海 TANG Shuai;WEI Huarong;HONG Bihai(Faculty of Engineering,Lishui University,Lishui 323000,Zhejiang)

机构地区：[1]丽水学院工学院,浙江丽水323000

出　　处：《丽水学院学报》2018年第2期24-30,共7页Journal of Lishui University

摘　　要：利用由厄兰分布和幂次律函数组成的标度函数分析Au-Au在质心能量200 Ge V下不同中心度区碰撞产生的各类末态产物的横动量分布。结果表明,模型分析结果与由PHENIX合作组测量的实验数据吻合得很好。在此基础上,提取碰撞系统的平均动力学冻结温度,粒子的平均横向流速和平均流速。所得结果与之前的萨里斯分布结果相比,平均动力学冻结温度略微低些,粒子的平均横向流速和平均流速相差不大。The transverse momentum spectra of final-state particles produced in Au-Au collisions with different centrality intervals at■=200 GeV are analyzed by the index Function comprised of an Erlang distribution and a power-law function.The study shows that the calculated results of the model agree well with the experimental data measured by the PHENIX collaboration.On this basis,the mean kinetic freeze-out temperature of interacting system at the stage of kinetic freeze-out,and the mean transverse flow velocity and mean flow velocity of particles are extracted.Compared with the results from the Tsallis Statistics in previous work,the mean kinetic freeze-out temperature is slightly lower,and the mean transverse flow velocity and mean flow are approximately the same.

关 键 词：横动量分布 标度函数 动力学冻结温度 横向流 高能碰撞 

分 类 号：O571.6[理学—粒子物理与原子核物理]