Hadron production in non linear relativistic mean field models

TL;DR

This paper investigates hadron production in relativistic mean field models, specifically using a non-linear Walecka model with hyperon considerations, to compare with RHIC collision data and analyze baryonic interactions.

Contribution

It introduces a parametrization of the non-linear Walecka model that incorporates hyperon binding energies and examines hyperon-meson couplings' effects on particle yields.

Findings

Results align well with experimental data.

Weak dependence of yields on hyperon-meson couplings.

Small baryon-baryon repulsion observed.

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.