Origin of subthreshold K^+ production in heavy ion collisions

Abstract

We investigate the origin of subthreshold $K^{+}$ production in heavy ion collisions at intermediate energies. In particular we study the influence of the pion induced $K^{+}$ creation processes. We find that this channel shows a strong dependence on the size of the system, i.e., the number of participating nucleons as well as on the incident energy of the reaction. In an energy region between 1--2 GeV/nucleon the pion induced processes essentially contribute to the total yield and can even become dominant in reactions with a large number of participating nucleons. Thus we are able to reproduce recent measurements of the KaoS Collaboration for 1 GeV/nucleon Au on Au reactions adopting a realistic momentum dependent nuclear mean field.

6 pages Latex using RevTex, revised version accepted for publication in Phys. Rev. C

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