Chemical Nonequilibrium in High Energy Nuclear Collisions
Abstract
Strange particles produced in S-Au/W/Pb 200 A GeV and Pb-Pb 158 A GeV reactions are described invoking final hadronic phase space in thermal equilibrium, but allowing chemical non-equilibrium. Several sets of statistical freeze-out parameters are obtained for each system, invoking different models of dense matter. We show that only when allowing for strange and non-strange flavor abundance non-equilibrium, a statistically significant description of the experimental results is obtained. Physical properties of the fireball at chemical freeze-out condition are evaluated and considerable universality of hadron freeze-out between the two different collision systems is established. The relevance of the Coulomb effect in the highly charged Pb-Pb fireballs for the chemical analysis are discussed. The influence of explosive collective matter flow is also described.
Keywords
Cite
@article{arxiv.hep-ph/9810332,
title = {Chemical Nonequilibrium in High Energy Nuclear Collisions},
author = {Jean Letessier and Johann Rafelski},
journal= {arXiv preprint arXiv:hep-ph/9810332},
year = {2008}
}
Comments
Presented at the International Conference Strangeness in Quark Matter held in Padova, July 1998 To appear in: Journal of Physics G 16 pages incl. one figure; v2: minor typos corrected