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Rho properties in a hot meson gas

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arxiv hep-ph/9902268 v2 pith:FPZKCCNA submitted 1999-02-08 hep-ph

classification hep-ph
keywords dileptonmesonreactionsresonancesaccountedapproachbaryon-freebeen
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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.

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