### Browsing by Author "Redlich, K"

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- ItemRestrictedOn the chemical equilibration of strangeness-exchange reactions in heavy-ion collisions(2005) Cleymans, J; Forster, A; Oeschler, H; Redlich, K; Uhlig, FThe strangeness-exchange reaction π + Y ↔ K− + N is shown to be the dynamical origin of chemical saturation and equilibration for K− production in heavy-ion collisions up to beam energies of 10 AGeV. The hyperons occurring in this process are produced in association with K+ in baryon–baryon and meson–baryon interactions. This connection is demonstrated by the ratio of 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.
- ItemOpen AccessProbability distributions in statistical ensembles with conserved charges(2005) Cleymans, J; Redlich, K; Turko, LThe probability distributions for charged particle numbers and their densities are derived in statistical ensembles with conservation laws. It is shown that if this limit is properly taken, then the canonical and grand canonical ensembles are equivalent. This equivalence is proven on the most general probability distribution level.
- ItemOpen AccessTransition from baryonic to mesonic freeze-out(2005) Cleymans, J; Oeschler, H; Redlich, K; Wheaton, SThe recently discovered sharp peak in the K+/π+ ratio in relativistic heavy-ion collisions is discussed in the framework of the statistical model. In this model a rapid change is expected as the hadronic gas undergoes a transition from a baryon-dominated to a meson-dominated gas. The transition occurs at a temperature T=140MeV and baryon chemical potential μB=410MeV corresponding to an incident energy of sNN=8.2GeV. The maximum in the Λ/π ratio is well reproduced by the statistical model, but the change in the K+/π+ ratio is much less pronounced than the one observed by the NA49 Collaboration. The calculated smooth increase of the K−/π− ratio and the shape of the Ξ−/π+ and Ω−/π+ ratios exhibiting maxima at different incident energies is consistent with the presently available experimental data. We conclude that the measured particle ratios with 20–30% deviations agree with a hadronic freeze-out scenario. These deviations seem to occur just in the transition from baryon-dominated to meson-dominated freeze-out.