p+p碰撞中带电粒子赝快度分布的能量依赖性研究

Investigations for Energy Dependences of Pseudorapidity Distributions of Charged Particles in p+p Collisions

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(?)=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。

Abstract： 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 √s=23.6 to 900 GeV.