DILEPTONS FROM DISORIENTED CHIRAL CONDENSATES

Disoriented chiral condensates or long wavelength pionic oscillations and their interaction with the thermal environment can be a significan t source of dileptons. We calculate the yield of such dilepton product ion within the linear a model. both in a quantum mean-field treatment and in a semiclassical approximation. We then illustrate the basic fea tures of the dilepton spectrum in a schematic model. We find that dile pton yield with invariant mass near and below 2m(pi) due to the soft p ion modes can be up to two orders of magnitude larger than the corresp onding equilibrium yield.