Abstract
We report on high acceptance di-electron spectrometer (HADES) measurements of strange hadrons in the collision systems Ar(1.756 AGeV)+KCl and p+p at 3.5 GeV. Comparisons of K0s transverse mass and rapidity spectra to IQMD transport model calculations give a strong hint to a repulsive kaon–nucleon potential. The effect of the potential shows up strongest at very low transverse momenta, which were measured by HADES with high statistics. Statistical model fits show a fair agreement to the particle yields measured in the heavy-ion data, apart from the Ξ− yield which is off by more than an order of magnitude. Furthermore, first results from the Σ(1385)+ reconstruction in p+p reactions are presented, showing an excellent agreement with published data.
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