Thermal Properties of a Hot Pion Gas beyond the Quasiparticle Approximation

Abstract

Within the Matsubara formalism we derive expressions for the pion self-energy and the two-pion propagator in a hot pion gas. These quantities are used to selfconsistently calculate the in-medium $\pi \pi$ amplitude beyond the quasiparticle approximation (QPA). The results are shown to differ significantly from QPA-based calculations. We also examine the impact of chiral constraints on the $\pi \pi$ interaction in a chirally improved version of the Jülich $\pi \pi$ model.

12 pages LaTex (3 figures uuencoded)

References in corpus (3)

• S-Wave Pion-Pion Correlations in Dense Nuclear Matter
• Pion Properties in a Hot $\Pi N\Delta$ Gas
• Selfconsistent Description of a Thermal Piongas

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