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Observation of an energy-dependent difference in elliptic flow between particles and anti-particles in relativistic heavy ion collisions

Elliptic flow (\(v_{2}\)) values for identified particles at mid-rapidity in Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at RHIC at \(\sqrt{s_{NN}}=\) 7.7--62.4 GeV, are presented. A beam-energy dependent difference of the values of \(v_{2}\) between particles and corre...

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Published in:arXiv.org 2013-01
Main Authors: Adkins, J K, Arkhipkin, D, Averichev, G S, Balewski, J, Betts, R R, Bhati, A K, Bhattarai, Bielcikova, J, Brovko, S G, Butterworth, J, M Calderón de la Barca Sánchez, Chaloupka, P, Chattopadhyay, S, Cui, X, Deng, J, Dilks, Dion, A, Dong, X, Draper, J E, Elnimr, M, Eppley, G, Fatemi, R, Filip, P, Finch, E, Gagliardi, C A, Geurts, F, Gupta, A, Guryn, W, Haag, B, Hajkova, O, L-X Han, Haque, R, Hirsch, A, Huck, P, Humanic, T J, Jena, C, Kauder, K, Ke, H W, Koetke, D D, Kravtsov, P, Landry, K D, Leight, W, Lima, L M, Liu, F, Llope, W J, Luo, X, Ma, G L, Ma, Y G, Majka, R, McDonald, D, Mustafa, M K, Naglis, M, Nandi, B K, Nogach, L V, K Oh, Ohlson, A, Okorokov, V, Pachr, M, Pal, S K, Pawlik, B, Perkins, C, Planinic, M, Pluta, J, Poskanzer, A M, Powell, C B, Pruthi, N K, Ramachandran, S, Romero, J L, Ruan, L, Rusnak, J, Sahoo, N R, Salur, S, Sandweiss, J, Schmidke, B, Shah, N, Srivastava, B, Stanislaus, T D S, Stevens, J R, Stock, R, Szanto de Toledo, A, Thomas, J H, Timmins, A R, Tribble, R E, Trzeciak, B A, G Van Buren, Vertesi, R, Viyogi, Y P, Wada, M, Walker, M, Webb, G, Xiao, Z, Xie, W, N Xu, Y Xu, I-K, Yoo, Zawisza, Y, Zha, W, Zhang, J B, Zhang, Z P, Zhu, Y H
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Language:English
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Summary:Elliptic flow (\(v_{2}\)) values for identified particles at mid-rapidity in Au+Au collisions, measured by the STAR experiment in the Beam Energy Scan at RHIC at \(\sqrt{s_{NN}}=\) 7.7--62.4 GeV, are presented. A beam-energy dependent difference of the values of \(v_{2}\) between particles and corresponding anti-particles was observed. The difference increases with decreasing beam energy and is larger for baryons compared to mesons. This implies that, at lower energies, particles and anti-particles are not consistent with the universal number-of-constituent-quark (NCQ) scaling of \(v_{2}\) that was observed at \(\sqrt{s_{NN}}=\) 200 GeV.
ISSN:2331-8422
DOI:10.48550/arxiv.1301.2347