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Probing the nuclear equation of state by K+ production in heavy ion collisions

C. Fuchs, Amand Faessler, E. Zabrodin, Yu-Ming Zheng

nucl-tharXiv:nucl-th/0011102

Abstract

The dependence of K+ production on the nuclear equation of state is investigated in heavy ion collisions. An increase of the excitation function of K+ multiplicities obtained in heavy (Au+Au) over light (C+C) systems when going far below threshold which has been observed by the KaoS Collaboration strongly favours a soft equation of state. This observation holds despite of the influence of an in-medium kaon potential predicted by effective chiral models which is necessary to reproduce the experimental K+ yields.

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