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Particles 2019, 2(1), 140-149; https://doi.org/10.3390/particles2010010

Low-Momentum Pion Enhancement from Schematic Hadronization of a Gluon-Saturated Initial State

1
Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, RU-119991 Moscow, Russia
2
Institute of Theoretical Physics, University of Wrocław, 50-204 Wrocław, Poland
3
Bogoliubov Laboratory for Theoretical Physics, JINR Dubna, 141980 Dubna, Russia
4
Department of Theoretical Nuclear Physics, National Research Nuclear University (MEPhI), 115409 Moscow, Russia
*
Author to whom correspondence should be addressed.
Received: 18 December 2018 / Revised: 3 March 2019 / Accepted: 6 March 2019 / Published: 11 March 2019
(This article belongs to the Special Issue Nonequilibrium Phenomena in Strongly Correlated Systems)
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Abstract

We study the particle production in the early stage of the ultrarelativistic heavy-ion collisions. To this end the Boltzmann kinetic equations for gluons and pions with elastic rescattering are considered together with a simple model for the parton-hadron conversion process (hadronisation). It is shown that the overpopulation of the gluon phase space in the initial state leads to an intermediate stage of Bose enhancement in the low-momentum gluon sector which due to the gluon-pion conversion process is then reflected in the final distribution function of pions. This pattern is very similar to the experimental finding of a low-momentum pion enhancement in the ALICE experiment at the CERN Large Hadron Collider (LHC). Relations to the thermal statistical model of hadron production and the phenomenon of thermal and chemical freeze-out are discussed in this context. View Full-Text
Keywords: Boltzmann equation; gluon saturation; pion enhancement; ALICE; LHC; thermalization; hadronization Boltzmann equation; gluon saturation; pion enhancement; ALICE; LHC; thermalization; hadronization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Nazarova, E.; Juchnowski, Ł.; Blaschke, D.; Fischer, T. Low-Momentum Pion Enhancement from Schematic Hadronization of a Gluon-Saturated Initial State. Particles 2019, 2, 140-149.

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