Finite pion width effects on the rho--meson

Details Finite pion width effects on the rho--meson Finite pion width effects on the rho--meson

2000-07-07

arxiv.org/abs/hep-ph/0007070v3

Nucl.Phys. A683 (2000) 369-382

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, uses feynmp.sty (included), clarified some points on gauge invariance and added some more reference

Scientific paper

10.1016/S0375-9474(00)00462-0

We study the influence of the finite damping width of pions on the in-medium properties of the rho-meson in an interacting meson gas model at finite temperature. Using vector dominance also implications on the resulting dilepton spectra from the decay of the rho-meson are presented. A set of coupled Dyson equations with self energies up to the sunset diagram level is solved self consistently. Following a Phi-derivable scheme the self energies are dynamically determined by the self consistent propagators. Some problems concerning the self consistent treatment of vector or gauge bosons on the propagator level, in particular, if coupled to currents arising from particles with a sizable damping width, are discussed.

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