【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.更多还原

【Abstract】 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.更多还原