QCD SUM-RULES FOR A RHO-MESON IN DENSE MATTER

Using the QCD sum rules, we study the property of a rho meson in dense hadronic matter. Instead of the simple rho meson pole approximation for the rho meson spectral function at low momenta, we evaluate it using the vector dominance model that takes into account the interaction between the rho meson and the pion. Including pion modification by the delta-hole polarization in the nuclear medium, we find that as the nuclear density increases the rho meson peak in the spectral function shifts to smaller invariant masses. We discuss the possibility of studying the rho meson property in dense matter via the dilepton invariant mass spectrum from heavy-ion collisions.