Elliptic flow in heavy-ion collisions at energies sNN=2.739 GeV

Yu. B. Ivanov and A. A. Soldatov
Phys. Rev. C 91, 024914 – Published 26 February 2015

Abstract

The transverse-momentum-integrated elliptic flow of charged particles at midrapidity, v2(charged), and that of identified hadrons from Au+Au collisions are computed in a wide range of incident energies 2.7 sNN39 GeV. The simulations are performed within a three-fluid model by employing three different equations of state (EoSs): a purely hadronic EoS and two versions of the EoS involving the deconfinement transition—a first-order phase transition and a smooth crossover one. The present simulations demonstrate low sensitivity of v2(charged) to the EoS. All considered scenarios equally well reproduce recent STAR data on v2(charged) for mid-central Au+Au collisions and properly describe its change of sign at the incident energy decrease below sNN3.5 GeV. The predicted integrated elliptic flow of various species exhibits a stronger dependence on the EoS. A noticeable sensitivity to the EoS is found for antibaryons and, to a lesser extent, for K mesons. In particular, the v2 excitation functions of antibaryons exhibit a nonmonotonicity within the deconfinement scenarios that was predicted by Kolb, Sollfrank, and Heinz. However, low multiplicities of antibaryons at sNN10 GeV result in large fluctuations of their v2, which may wash out this nonmonotonicity.

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  • Received 17 September 2014
  • Revised 12 January 2015

DOI:https://doi.org/10.1103/PhysRevC.91.024914

©2015 American Physical Society

Authors & Affiliations

Yu. B. Ivanov1,2,* and A. A. Soldatov2,†

  • 1National Research Centre “Kurchatov Institute” (NRC “Kurchatov Institute”), 123182 Moscow, Russia
  • 2National Research Nuclear University “MEPhI” (Moscow Engineering Physics Institute), Moscow 115409, Russia

  • *y.ivanov@gsi.de
  • saa@ru.net

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Issue

Vol. 91, Iss. 2 — February 2015

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