Reinterpretation of Thermal Dilepton Emission Rate by Spectral Functions

Abstract

We reinterpret the dilepton emission rate from a hadronic gas expected to be produced in heavy ion collisions in terms of the spectral functions available from the $e^{+}{e}^{-}$ annihilation and the $\tau$ lepton decays experiments. We take into account all possible hadronic state especially the multi-pion contributions to the dilepton emission and the parity mixing phenomenon due to the soft final-state corrections. A new compilation of the experimental data for the spectral functions is presented.

12 pages in LaTeX, two uuencoded postscript figures

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