Rho properties in a hot meson gas

Abstract

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.

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

References in corpus (5)

• The Spectral Function of the Rho Meson in Nuclear Matter
• Momentum Dependence of the Pion Cloud for Rho Mesons in Nuclear Matter
• A Microscopic Calculation of Photoabsorption Cross Sections on Protons and Nuclei
• Mass Shift and Width Broadening of Rho-Mesons Produced in Heavy Ion Collisions
• Off-shell effects in dilepton production from hot interacting mesons

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• Intermediate mass dileptons in relativistic nuclear collisions
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