Rho meson spectral function in dense matter

The spectral function of a rho meson at rest in dense hadronic matter is studied in the vector dominance model by including both the effects of the delta-hole polarization on pion and the scaling in-medium hadron masses of Brown and Rho. It is found that as the nuclear density increases the rho meson peak moves to smaller invariant masses with diminishing strength. Also, a low mass peak around three times the pion mass appears and shifts down with increasing density. The change of the rho meson property in dense matter can be investigated via the dilepton invariant mass spectrum from heavy-ion collisions. ((orig.))