高能重离子碰撞中的集体流与空间-动量关联  

Collective Flow and the Space-Momentum Correlation in High Energy Heavy Ion Collisions

作　　者：霍雷[1] 张卫宁[1] 陈相君[2] 张景波[2] 唐圭新[2] 

机构地区：[1]兰州重离子加速器国家实验室原子核理论中心,兰州730000 [2]哈尔滨工业大学理论物理教研室,哈尔滨150001

出　　处：《高能物理与核物理》2003年第1期53-57,共5页High Energy Physics and Nuclear Physics

基　　金：哈尔滨工业大学校基金(HIT.1999.015)资助~~

摘　　要：高能重离子碰撞中,末态粒子的侧向流与椭圆流间存在方位角集体关联,该关联对反应中集体流的性质反映敏感.碰撞时,系统在坐标空间的演化与动量空间的演化过程相互影响,表现出明显的空间-动量关联.不同事件中椭圆流形式的差别与此空间-动量关联有关,反映了系统演化过程的涨落.The transverse flow in heavy ion collisions can be characterized by the azimuthal anisotropy of the final state particles. A clear signature of the azimuthal correlation between directed and elliptic flow is evidenced in the model calculations . It is found that the azimuthal correlation is sensitive to the type of elliptic flow. The collective transverse expansion in coordinate space affects the azimuthal distributions of the final state particles in momentum space and the space-momentum correlation would develop. The study indicates that the behaviour of elliptic flow in different events depends on the evaluation of event-by-event dynamical fluctuations.

关 键 词：高能重离子碰撞 方位角分布 集体流 空间-动量关联 末态粒子 

分 类 号：O572.21[理学—粒子物理与原子核物理]