Correlation among singly charged particles emitted in the forward and backward pseudo-rapidity cones is measured in 16O-Ag/Br and 32S-Ag/Br interactions at an incident energy of 200 GeV/nucleon. Event-by-event fluctuations in the charged particle multiplicities and their pseudo-rapidity values are also investigated in terms of some known statistical measures. Evidences of short-ranged particle correlation and cluster formation in the pseudo-rapidity space are found from our analysis. A microscopic transport model based on the Ultra-relativistic Quantum Molecular Dynamics could not match the experimental results. The differences between experimental observation and corresponding simulation could neither be accounted for even when a Bose–Einstein type of correlation effect is implemented into the simulated data.

中文翻译：

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200A GeV 核-核碰撞中的前后多重相关性和逐个事件多重波动

在前向和后向伪快速锥中发射的单带电粒子之间的相关性测量为16O-Ag/Br 和32S-Ag/Br 相互作用在入射能量为200GeV/核子。还根据一些已知的统计测量来研究带电粒子多重性及其伪快速值的逐个事件波动。从我们的分析中发现了伪快速空间中短程粒子相关和簇形成的证据。基于超相对论量子分子动力学的微观输运模型无法匹配实验结果。即使将玻色-爱因斯坦类型的相关效应应用到模拟数据中，也无法解释实验观察和相应模拟之间的差异。