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高能重离子碰撞产生的带电粒子由两部分组成:一部分来源于碰撞产生的高温高密度物质,另一部分是带头粒子。假设高温高密度物质按照由演化过程主导的流体力学的规律膨胀并冻析为带电粒子,带头粒子来源于参与者且具有大致相同的能量。基于该假设,得到了高能重离子碰撞带电粒子的赝快度分布,并与BNL-RHIC上的PHOBOS合作组在sNN(1/2)=62.4与200 Ge V的Cu-Cu碰撞中给出的实验结果相比较,理论与实验测量符合得很好。
Charged particles generated by high-energy heavy ion collisions are composed of two parts: one part comes from the high-temperature and high-density material generated by the collision and the other part is the leading particle. Assuming high-temperature, high-density material expands and freeze-fades to charged particles according to the laws of fluid mechanics dominated by evolutionary processes, the lead particles originate from the participants and have approximately the same energy. Based on this assumption, the pseudorapidity distribution of charged particles of high energy heavy ion collisions was obtained and was compared with the PHOBOS cooperative group on BNL-RHIC for Cu-Cu collisions of sNN (1/2) = 62.4 and 200 GeV Compared with the experimental results, the theoretical and experimental measurements are in good agreement.