On the chemical equilibration of strangeness-exchange reaction in heavy-ion collisions

Abstract

The strangeness-exchange reaction pi + Y -> K- + N is shown to be the dynamical origin of chemical equilibration for K- production in heavy-ion collisions up to beam energies of 10 A GeV. The hyperons occurring in this process are produced associately with K+ in baryon-baryon and meson-baryon interactions. This connection is demonstrated by the ratio K-/K+ which does not vary with centrality and shows a linear correlation with the yield of pions per participant. At incident energies above AGS this correlation no longer holds due to the change in the production mechanism of kaons.

arXiv comment9 pages, 4 figures

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• Transport Theories for Heavy Ion Collisions in the 1 AGeV Regime
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• Energy Dependence of Strangeness Production in Heavy-ion Collision