关键词: 
修正的Landau 流体力学模型 /
带头粒子 /
高斯分布

摘要: 在p+p 碰撞中，只有两个带头粒子，一个处在弹碎裂区，另一个处在靶碎裂区。研究表明:如同核-核碰撞一样，修正的Landau 流体力学模型本身不足以对p+p 碰撞中带电粒子赝快度分布的实验测量给出很好的描述，只有在考虑了带头粒子效应后，理论才能很好地与实验结果相一致。在ps=23.6~900 GeV 的整个能量范围内，理论与现有实验数据符合得很好。In a p+p collision, there are only two leading particles. One is in projectile fragmentation region,the other is in target fragmentation region. The investigation of present paper shows that, just like in nucleus-nucleus collisions, the revised Landau hydrodynamic model alone is not enough to have a good description to the measured pseudorapidity distributions of charged particles in p+p collisions. Only after the leading particles are taken into account as well, can the experimental data be matched up properly. The theoretical model works well in p+p collisions in the whole available energy region from ps=23.6 to 900 GeV.