Meson Production and Meson Properties at Finite Nuclear Density
W. Cassing
Abstract
The properties of π, η, K+ and K- mesons are studied in nuclear reactions from SIS to SPS energies within the covariant transport approach HSD in comparison to the experimental data. Whereas the pion, η and kaon abundancies and spectra indicate little or vanishing selfe-nergies for these mesons in the medium, antikaons (as well as antiprotons) are found to experience strong attractive potentials in nucleus-nucleus collisions at SIS energies. However, even when including these potentials the K+ and K- spectra at AGS energies are noticeably underestimated showing an experimental excess of strangeness that points towards a nonhadronic phase in these reactions. On the other hand the K+, K- production at SPS energies is well described by the hadronic approach without incorporating any parton degrees of freedom.
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