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

Vovchenko, V. and Gorenstein, M. I. and Satarov, L. M. and Mishustin, I. N. and Csernai, László Pál and Kisel, I. and Stocker, H. (2016) Entropy production in chemically nonequilibrium quark-gluon plasma created in central Pb plus Pb collisions at energies available at the CERN Large Hadron Collider. PHYSICAL REVIEW C, 93 (1). ISSN 2469-9985

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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 non-equilibrium 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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