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Hadron production in non-linear relativistic mean field models

Authors: M. Chiapparini, M. E. Bracco, A. Delfino, M. Malheiro,D. P. Menezes, C. ProvidĂȘncia

Ref.: NUCLEAR PHYSICS A 826, 178-189 (2009)

Abstract: By using a parametrization of the non-linear Walecka model which takes into account the binding energy of different hyperons, we present a study of particle production yields measured in central Au-Au collision at RHIC. Two sets of different hyperon-meson coupling constants are employed in obtaining the hadron production and chemical freeze-out parameters. These quantities show a weak dependence on the used hyperon-meson couplings. Results are in good overall accordance with experimental data. We have found that the repulsion among the baryons is quite small and, through a preliminary analysis of the effective mesonic masses, we suggest a way to improve the fittings.

DOI: .1016/j.nuclphysa.2009.05.002