Near-thermal equilibrium with Tsallis distributions in heavy ion collisions

Details Near-thermal equilibrium with Tsallis distributions in heavy ion collisions Near-thermal equilibrium with Tsallis distributions in heavy ion collisions

2008-12-08

arxiv.org/abs/0812.1471v2

J.Phys.G36:064018,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 6 figures

Scientific paper

10.1088/0954-3899/36/6/064018

Hadron yields in high energy heavy ion collisions have been fitted and reproduced by thermal models using standard statistical distributions. These models give insight into the freeze-out conditions at varying beam energies. In this paper we investigate changes to this analysis when the statistical distributions are replaced by Tsallis distributions for hadrons. We investigate the appearance of near-thermal equilibrium state at SPS and RHIC energies. We obtain better fits with smaller chi^2 for the same hadron data, as applied earlier in the thermal fits for SPS energies but not for RHIC energies. This result indicates that at RHIC energies the final state is very well described by a single freeze-out temperature with very little room for fluctuations.

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