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

J. CleymansUCT–CERN Research Centre and Department of Physics, University of Cape Town, Rondebosch 7701, Cape Town, South AfricaG. HamarMTA KFKI RMKI, Research Institute for Particle and Nuclear Physics, PO Box 49, Budapest, 1525, HungaryP. LévaiMTA KFKI RMKI, Research Institute for Particle and Nuclear Physics, PO Box 49, Budapest, 1525, HungaryS. WheatonUCT–CERN Research Centre and Department of Physics, University of Cape Town, Rondebosch 7701, Cape Town, South Africa

2009en

ABI

Annotatsiya

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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DOI: 10.1088/0954-3899/36/6/064018

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