Thermal Properties of a Hot Pion Gas beyond the Quasiparticle Approximation

Details Thermal Properties of a Hot Pion Gas beyond the Quasiparticle Approximation Thermal Properties of a Hot Pion Gas beyond the Quasiparticle Approximation

1995-02-08

arxiv.org/abs/nucl-th/9502023v2

Phys.Lett. B351 (1995) 50-55

Physics

Nuclear Physics

Nuclear Theory

12 pages LaTex (3 figures uuencoded)

Scientific paper

10.1016/0370-2693(95)00361-N

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 J\"ulich $\pi\pi$ model.

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