1993/06/16 by Ralf Rapp, R. Rapp, J. Wambach · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #High-Energy Particle Collisions Research #High-pressure geophysics and materials #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.1016/0370-2693(93)91604-l
published as Phys.Lett. B315 (1993) 220-225 · 11 pages, LATEX, 4 figures (not included, available from the authors), KFA-IKP(TH)-1993-18
arxiv created 1993/06/16 · openalex publication_date 1993/10/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We examine a hot pion gas by including medium modifications of the two-body scattering amplitude as well as mean-field effects selfconsistently. In contrast to earlier calculations, the in-medium T-matrix is rather close to the free one while the mean-field potential agrees well with lowest-order estimates. We also discuss the validity of the quasiparticle approximation. It is found that it is reliable for temperatures up to ∼ 150 MeV. Above this temperature off-shell effects in the pion selfenergy become important, especially if the pions are strongly out of chemical equilibrium.