Reinterpretation of thermal dilepton emission rate by spectral functions

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.

Note:

12 pages in LaTeX, two uuencoded postscript figures

scattering: heavy lepton
heavy lepton: scattering
yield: dilepton
hadron: gas
particle source: temperature
electron positron: annihilation
annihilation: electron positron
tau: semileptonic decay
semileptonic decay: tau
pi: multiple production

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