Thermal Pions

Details Thermal Pions Thermal Pions

1993-06-15

arxiv.org/abs/hep-ph/9306275v1

Nucl.Phys. A566 (1994) 141c-147c

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pp, LaTeX, uses espcrc1.sty from North-Holland Publishing, BUTP-93/16

Scientific paper

10.1016/0375-9474(94)90618-1

I discuss the absorption and dispersion of pions in hot matter. A two-loop calculation in the framework of chiral perturbation theory is presented and its result is compactly written in terms of the two- and three-particle forward $\pi \pi$ scattering amplitudes. At modest temperatures, $T \le 100$ MeV, the change in the pion mass is small and its dispersion law closely resembles the free space one. At these temperatures, all quantities of interest are given to a good degree of accuracy by the first term in the virial expansion which is linear in the density. (BUTP-93/16, uses espcrc1.sty from North-Holland Publishing)

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