近年来，高能物理界取得的最重要的成就之一是发现高能重离子碰撞产生的高温高密度物质极近理想流体。描述这种流体膨胀过程的最佳工具是相对论流体力学。在Hwa-Bjorken与Landau相对论流体力学统一描述理论的基础上，考虑到带头粒子的贡献，讨论了带电粒子的赝快度分布。由流体冻析产生的带电粒子的快度分布可由统一流体力学理论解析得到，带头粒子的快度分布假设具有高斯形式。与LHC-RHIC-PHOBOS合作组在能量分别为√sNN=62.4与130 GeV 的Au-Au碰撞中的实验测量相比较得知，理论与实验结果符合得很好。
One of the most important achievements obtained in high energy physics in recent years is the discovery that the matter created in nucleus-nucleus collisions behaves like a nearly perfect fluid. The best tool for describing the expansions of this fluid is relativistic hydrodynamics. By taking into account the contributions of leading particles, this paper discusses the pseudorapidity distributions of charged particles on the basis of a theory of unified description of Hwa-Bjorken and Landau relativistic hydrodynamics. The rapidity distributions of charged particles frozen out from fluid can be obtained analytically from unified hydrodynamics. The rapidity distributions of leading particles are assumed having Gaussian form. Known from a comparison with experimental observations made by LHC-RHIC-PHOBOS Collaboration in Au-Au collisions at √sNN =62.4 and 130 GeV, respectively, the theoretical results are in good accordance with experimental results.
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