Rho properties in a hot meson gas

Details Rho properties in a hot meson gas Rho properties in a hot meson gas

1999-02-08

arxiv.org/abs/hep-ph/9902268v2

Phys.Rev. C60 (1999) 024903

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages ReVTeX including 5 eps-figures, slightly revised version (modified title, additional comparative comments)

Scientific paper

10.1103/PhysRevC.60.024903

Using effective meson Lagrangians we study the interaction of rho mesons in a hot baryon-free system. Various mesonic resonances in direct $s$-channel reactions are investigated employing standard self-energy techniques, including new reactions that have up to now not been considered in a self-consistent approach at finite temperature. The importance of subthreshold resonances, which are readily accounted for through off-shell effects within our framework, is emphasized. Special care is taken in reproducing radiative decay widths, as they provide valuable constraints on the evaluation of dilepton spectra. In particular, we compare our results for dilepton production rates to earlier calculations based on an incoherent summation of individual processes.

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