Chemical nonequilibrium and deconfinement in 200A GeV sulphur induced reactions

Jean Letessier, Johann Rafelski

Research output: Contribution to journalArticlepeer-review

60 Scopus citations


We interpret hadronic particle abundances produced in S-Au/W/Pb [Formula Presented] 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 nonequilibrium a highly significant fit to experimental particle abundance data emerges, which supports the possibility of strangeness distillation. We find under different strategies stable values for freeze-out temperature [Formula Presented] baryochemical potential [Formula Presented] ratio of strangeness [Formula Presented] and light quark [Formula Presented] phase space occupancies [Formula Presented] and [Formula Presented] without accounting for collective expansion (radial flow). When introducing flow effects which allow a consistent description of the transverse mass particle spectra, yielding [Formula Presented] we find [Formula Presented] The strange quark fugacity is fitted at [Formula Presented] suggesting chemical freeze-out directly from the deconfined phase.

Original languageEnglish (US)
Pages (from-to)947-954
Number of pages8
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - 1999

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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