Pion Properties in a Hot ΠN Δ Gas
R. Rapp, J. Wambach
Abstract
Based on a recent meson-exchange model for the vacuum ππ interaction we compute selfconsistently the in-medium ππ scattering amplitude and pion selfenergy in a hot πNΔ gas. The contributions to the pion selfenergy are calculated from the ππ T-matrix as well as from p-wave interaction with nucleons and thermally abundant Δ's. Results are presented for two scenarios believed to be realized in the relativistic heavy ion collisions performed at the GSI-SIS and the CERN-SpS. Possible implications for the observed soft pion enhancement at both SIS and SpS are indicated.
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