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Title: Beam-energy dependence of identified two-particle angular correlations in $$\sqrt{S_{NN}} = 7.7 – 200$$ GeV Au + Au collisions

Journal Article · · Physical Review. C
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The two-particle angular correlation functions, $$R_2$$ , of pions, kaons, and protons in Au + Au collisions at $$\sqrt{S_{NN}}$$ = 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.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); University of Illinois, Chicago, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; FG02-94ER40865; AC02-05CH11231
OSTI ID:
1583118
Report Number(s):
BNL--213535-2020-JAAM
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 101; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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