Low-momentum pion enhancement from schematic hadronization of a gluon-saturated initial state

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 sh...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: Nazarova, Elizaveta, Juchnowski, Łukasz, Blaschke, David, Fischer, Tobias
Format: Article
Language:English
Subjects:
Conversion
Distribution functions
Gluons
Ionic collisions
Kinetic equations
Momentum
Organic chemistry
Particle production
Pions
Statistical models
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Summary: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 CERN LHC. Relations to the thermal statistical model of hadron production and the phenomenon of thermal and chemical freeze-out are discussed in this context.
ISSN:2331-8422
DOI:10.48550/arxiv.1903.03025