Chemical non-equilibrium and deconfinement in 200 A GeV Sulphur induced reactions
Abstract
We interpret hadronic particle abundances produced in S--Au/W/Pb 200 A GeV reactions in terms of the final state hadronic phase space model and determine by a data fit of the chemical hadron freeze-out parameters. Allowing for the flavor abundance non-equilibrium a highly significant fit to experimental particle abundance data emerges, which supports possibility of strangeness distillation. We find under different strategies stable values for freeze-out temperature T_{f}=143\pm3 MeV, baryochemical potential \mu_{B}= 173\pm6 MeV, strangeness phase space occupancy \gamma_{s}=0.73\pm0.02, and light quark occupancy \gamma_{q}=1.22\pm0.05. The strange quark fugacity is fitted at \lambda_{s}=1.00\pm0.02 suggesting chemical freeze-out directly from the deconfined phase.Keywords
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