Selfconsistent Description of a Thermal Piongas

Abstract

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 $\sim 150$ MeV. Above this temperature off-shell effects in the pion selfenergy become important, especially if the pions are strongly out of chemical equilibrium.

11 pages, LATEX, 4 figures (not included, available from the authors), KFA-IKP(TH)-1993-18

References in corpus (1)

• Effects of Collective Potentials on Pion Spectra in Relativistic Heavy Ion Collisions

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• Pion Properties in a Hot $\Pi N\Delta$ Gas
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• Dilepton Enhancement by Thermal Pion Annihilation in the CERES Experiment
• Equation of State of an Interacting Pion Gas with Realistic $\pi$--$\pi$ Interactions
• Low mass enhanced probability of pion in hadronic matter due to its Landau cut contributions
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