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√SNN=200 GeV的d＋Au碰撞中末态带电粒子赝快度分布的对心度依赖性
Centrality Dependences of Charged-particle Pseudorapidity Distributions in d＋Au Collisions at √SNN=200 GeV
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摘要: 将核子-核子碰撞末态带电粒子的生成源分为二元核子-核子碰撞与带头粒子两部分,给出了末态带电粒子的赝快度分布与入射能量间的解析关系。以此为基础,将核-核碰撞末态带电粒子的生成源分为二元核子-核子碰撞、带头粒子与旁观者3部分,建立起了以碰撞参数与束流能量为自变量的末态带电粒子的赝快度分布,并用其分析了BNL-RHIC-PHOBOS合作组在（S_（NN））~（1/2）=200GeV的不同d＋Au对心度碰撞中所做的实验测量。所得结果与实验符合得很好。Abstract: We divide the particle generating sources in nucleon-nucleon collisions into two parts： binary collisions and leading particles, and present the analytical relation between charged-particle pseudorapidity distributions and incident energy. On the basis of this work, we classify the particle generating sources in nucleus-nucleus collisions into three parts： binary collisions, leading particles and spectators, and formulate the charged-particle pseudorapidity distributions as the function of incident energy and impact parameter. We then analyze with the model the experimental measurements in d＋ Au collisions at √SNN=200 GeV. The theoretical results are well consistent with experimental data.
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