Abstract
The dilepton spectrum from dense and hot nuclear matter, formed in the initial stage of high-energy heavy-ion collisions, is calculated from the consideration of pion-pion annihilations. The pion self-energy in nuclear matter is determined by the deltahole model. Its imaginary part is also treated selfconsistently. As in previous studies, we find that the dilepton spectrum at invariant masses around twice the pion mass is substantially enhanced when compared with the case in which the medium effect is neglected. The inclusion of the imaginary part of the pion self-energy leads to nonsingular dilepton yield.
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