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Beam-energy dependence of identified two-particle angular correlations ins root s(NN)=7.7-200 GeV Au + Au collisions
Adam, J Adamczyk, L Adams, JR Adkins, JK Agakishiev, G Aggarwal, MM Ahammed, Z Alekseev, I Anderson, DM Aparin, A
Adam, J
Adamczyk, L
Adams, JR
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Alekseev, I
Anderson, DM
Aparin, A
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Pre-print
Date
2020-01-30
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DOI
10.1103/PhysRevC.101.014916
Abstract
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 RHIC. 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 ({\it 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.
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PHYSICAL REVIEW C
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