Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at root s(NN)=7.7-62.4 GeV

0458122 - ÚJF 2017 RIV US eng J - Journal Article
Adamczyk, L. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Tlustý, David - Trzeciak, B. A. - Vértési, Robert … Total 339 authors
Centrality dependence of identified particle elliptic flow in relativistic heavy ion collisions at root s(NN)=7.7-62.4 GeV.
Physical Review. C. Roč. 93, č. 1 (2016), s. 014907. ISSN 0556-2813
R&D Projects: GA ČR GA13-20841S; GA MŠMT LG15001
Institutional support: RVO:61389005
Keywords : STAR collaboration * nuclear collisions * resonance
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.820, year: 2016

Elliptic flow (v(2)) values for identified particles at midrapidity in Au + Au collisions measured by the STAR experiment in the Beam Energy Scan at the Relativistic Heavy Ion Collider at root s(NN) = 7.7-62.4 GeV are presented for three centrality classes. The centrality dependence and the data at root s(NN) = 14.5 GeV are new. Except at the lowest beam energies, we observe a similar relative v(2) baryon-meson splitting for all centrality classes which is in agreement within 15% with the number-of-constituent quark scaling. The larger v(2) for most particles relative to antiparticles, already observed for minimum bias collisions, shows a clear centrality dependence, with the largest difference for the most central collisions. Also, the results are compared with a multiphase transport (AMPT) model and fit with a blast wave model.
Permanent Link: http://hdl.handle.net/11104/0258456