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.

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

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• Microscopic Models for Ultrarelativistic Heavy Ion Collisions
• Evidence for a high entropy phase in nuclear collisions
• Gluon production, cooling and entropy in nuclear collisions
• Chemical equilibration of strangeness
• On Chemical Equilibrium in Nuclear Collisions
• Strangeness in Pb-Pb Collisions at 158 A GeV

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