Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-12
Acta Phys.Polon. B30 (1999) 153-168
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages including one figure, to appear in Acta Phys. Pol. B
Scientific paper
The hadronic particle production data from relativistic nuclear Pb--Pb 158 A GeV collisions are successfully described within the chemical non-equilibrium model, provided that the analysis treats Omega and anti-Omega abundances with care. We further show that there is a subtle influence of the Coulomb potential on strange quarks in quark matter which is also seen in our data analysis, and this Coulomb effect confirms the finding made by chemical analysis in the S--Au/W/Pb 200 A GeV collisions that the hadron particle source is deconfined with respect to strange quark propagation. Physical freeze-out conditions (pressure, specific energy, entropy, and strangeness) are evaluated and considerable universality of hadron freeze-out between the two different collision systems is established.
Letessier Jean
Rafelski Johann
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