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首页> 外文期刊>Physical review, C >Beam-energy dependence of identified two-particle angular correlations ins root s(NN)=7.7-200 GeV Au + Au collisions
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Beam-energy dependence of identified two-particle angular correlations ins root s(NN)=7.7-200 GeV Au + Au collisions

机译：识别的双粒子角相关的光束能量依赖性INS ROCK S（NN）= 7.7-200 GEV AU + AU碰撞

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摘要

The two-particle angular correlation functions, R-2, of pions, kaons, and protons in Au + Au collisions at A root s(NN) = 7 . 7 , 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV were measured by the STAR experiment at the BNL Relativistic Heavy Ion Collider. These correlations were measured for both like-sign and unlike-sign charge combinations and versus the centrality. The correlations of pions and kaons show the expected near-side (i.e., at small relative angles) peak resulting from short-range mechanisms. The amplitudes of these short-range correlations decrease with increasing beam energy. However, the proton correlation functions exhibit strong anticorrelations in the near-side region. This behavior is observed for the first time in an A + A collision system. The observed anticorrelation is p(T) independent and decreases with increasing beam energy and centrality. The experimental results are also compared to the Monte Carlo models UrQMD, Hijing, and AMPT.
机译：在Root S（NN）= 7处的Au + Au碰撞中的双粒子角相关函数，r-2，kaOn和质子。 通过在BNL相对论重离子撞机的星形实验中测量7,11.5,14.5,19.6,27,39,62.4和200GEV。 测量这些相关性，用于签署和与签署的签署电荷组合和与中心相比。 接头和卡尔的相关性显示出由短距离机构产生的预期近侧（即，处于小的相对角度）峰值。 随着光束能量的增加，这些短距离相关性的幅度降低。 然而，质子相关函数在近侧区域表现出强烈的反形。 在A +碰撞系统中首次观察到该行为。 观察到的反形纹体是p（t）独立的，随着光束能量和中心性的增加而减小。 实验结果也与Monte Carlo Models Urqmd，Heding和Ampt相比。

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