RHIC能量下的^(197)Au+^(197)Au碰撞中的横向集体扩张运动

Transverse collective expansion in ^(197)Au+^(197)Au collisions at RHIC energies

讨论了RHIC能量下核-核碰撞中的横向集体扩张运动问题.利用高能核碰撞的模型——"相对论量子分子动力学(RQMD)"产生相应的数据予以分析,并与200GeV的197Au+197Au碰撞中的横动量分布的实验数据进行比较,我们看到,高能核碰撞中的横向扩张起源于碰撞的初始阶段,但是却主要是在碰撞的后期完成.而一些多重奇异粒子,如Λ、Ξ、Ω,由于它们较早的离开碰撞系统,因而带有碰撞的早期信息.

Using relativistic quantum molecular dynamics (RQMDv2.4) approach, this paper produces and analyzes the Monte Carlo events of Au+Au collisions at 200 GeV. Comparing with the reported transverse momentum distributions from the experiments, this paper argues that transverse expansion originated at the very early stage of the collisions is mainly developed during the late stage. Particles such as Λ,Ξ,Ω, carry the information of the early stage of the collisions.