Review of SIS Experimental Results on Strangeness

Abstract

>A review of meson emission in heavy ion collisions at incident energies around 1 -- 2 $A\cdot$GeV is presented. It is shown how the shape of the spectra and the various particle yields vary with system size, with centrality and with incident energy. A statistical model assuming thermal and chemical equilibrium and exact strangeness conservation (i.e. strangeness conservation per collision) explains most of the observed features. Emphasis is put onto the study of $K^{+}$ and $K^{-}$ emission. In the framework of this statistical model it is shown that the experimentally observed equality of $K^{+}$ and $K^{-}$ rates at threshold corrected energies $\sqrt{s}-\sqrt{s_{th}}$ is due to a crossing of two excitation functions. Furthermore, the independence of the $K^{+}$ to $K^{-}$ ratio on the number of participating nucleons observed between 1 and 10 $A\cdot$GeV is consistent with this model. The observed flow effects are beyond the scope of this model.

10 pages, 9 figures, Strangeness 2000, V International Conference on Strangeness in Quark Matter, July, 2000, Berkeley, California

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• What determines the $K^{-}$ multiplicity at energies around 1-2 AGeV?
• Cascade production in heavy-ion collisions at SIS energies
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• Observation of different azimuthal emission patterns for K+ and of K- mesons in Heavy Ion Collisions at 1-2 AGeV
• Kaon and Antikaon Production in Heavy Ion Collisions at 1.5 AGeV
• On the chemical equilibration of strangeness-exchange reaction in heavy-ion collisions
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• Review of the results of the KaoS Collaboration
• Survey of experimental data
• Strangeness at SIS energies
• Strange Particle Production from SIS to LHC
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• Hadron Production in Heavy Ion Collisions