Effects of meson mixing on dilepton spectra - art. no. 034903

The effect of scalar and vector mason mixing on the dilepton radiation from hot and dense hadronic matter is estimated in different isospin channels. In particular, we study the effect of sigma-omega and rho -a(0) mixing and calculate the corresponding rates. Effects are found to be significant comp ared to standard pi-pi and K-(K) over bar annihilations. While the mixing i n the isoscalar channel mostly gives a contribution in the invariant mass r ange between the two-pion threshold and the omega peak, the isovector chann el mixing induces an additional peak just below that of the phi. Experiment ally, the dilepton signals from rho -a(0) mixing seem to be more tractable than those from sigma-omega mixing.