Beam-energy dependence of identified two-particle angular correlations in sNN=7.7200 GeV Au+Au collisions

J. Adam et al. (STAR Collaboration)
Phys. Rev. C 101, 014916 – Published 30 January 2020

Abstract

The two-particle angular correlation functions, R2, of pions, kaons, and protons in Au + Au collisions at sNN=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 pT independent and decreases with increasing beam energy and centrality. The experimental results are also compared to the Monte Carlo models UrQMD, Hijing, and AMPT.

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  • Received 24 June 2019

DOI:https://doi.org/10.1103/PhysRevC.101.014916

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 101, Iss. 1 — January 2020

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