Entropy production in chemically nonequilibrium quark-gluon plasma created in central Pb+Pb collisions at energies available at the CERN Large Hadron Collider

V. Vovchenko, M. I. Gorenstein, L. M. Satarov, I. N. Mishustin, L. P. Csernai, I. Kisel, and H. Stöcker
Phys. Rev. C 93, 014906 – Published 19 January 2016

Abstract

We study the possibility that partonic matter produced at an early stage of ultrarelativistic heavy-ion collisions is out of chemical equilibrium. It is assumed that initially this matter is mostly composed of gluons, but quarks and antiquarks are produced at later times. The dynamical evolution of partonic system is described by the Bjorken-like ideal hydrodynamics with a time-dependent quark fugacity. The results of this model are compared with those obtained by assuming the complete chemical equilibrium of partons already at the initial stage. It is shown that in a chemically nonequilibrium scenario the entropy gradually increases, and about 25% of the total final entropy is generated during the hydrodynamic evolution of deconfined matter. We argue that the (anti)quark suppression included in this approach may be responsible for reduced (anti)baryon-to-meson ratios observed in heavy-ion collisions at energies available at the CERN Large Hadron Collider.

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  • Received 6 October 2015

DOI:https://doi.org/10.1103/PhysRevC.93.014906

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

V. Vovchenko1,2,3, M. I. Gorenstein1,4, L. M. Satarov1,5, I. N. Mishustin1,5, L. P. Csernai6, I. Kisel1,2, and H. Stöcker1,2,7

  • 1Frankfurt Institute for Advanced Studies, D-60438 Frankfurt am Main, Germany
  • 2Johann Wolfgang Goethe Universität, D-60438 Frankfurt am Main, Germany
  • 3Taras Shevchenko National University of Kiev, 03022 Kiev, Ukraine
  • 4Bogolyubov Institute for Theoretical Physics, 03680 Kiev, Ukraine
  • 5National Research Center “Kurchatov Institute”, 123182 Moscow, Russia
  • 6Institute for Physics and Technology, University of Bergen, 5007 Bergen, Norway
  • 7GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany

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Vol. 93, Iss. 1 — January 2016

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