RHIC能区的Landau流体力学模型研究

Study of Landau Hydrodynamic Model at RHIC Energy Region

在RHIC能区,末态产生粒子的快度分布并未表现为Bjorken流体力学理论所预言的中心快度平台分布特征,而与Landau流体力学模型所预测的相对论重离子碰撞末态粒子分布特征一致.本文利用Landau1+1维流体力学模型研究RHIC能区产生粒子的快度分布,讨论了在RHIC能区流体的横向膨胀位移对纵向快度分布的影响,由此得到的修正Landau流体力学模型可以很好地解释RHIC能区末态产生粒子π±、K±和反质子p等快度分布特征.

It is found that the rapidity distributions of final state particles at RHIC are constituent with the prediction of Landau hydrodynamic model,but not constituent with the features of central plat rapidity distributions predicated by Bjorken.The effect of transverse expansion displacement on longitudinal rapidity distributions is considered when we use Landau 1＋1 hydrodynamic model to discuss the rapidity distribution at RHIC.The modified Landau hydrodynamic model can explain the experimental results of production particles such as π±、K±and p-at RHIC energy region.