Phases, quantum interferences and effective vector meson masses in nuclei

We discuss the prospects for observing the mass of ϱ- and ω-mesons around nuclear matter density by studying their coherent photoproduction in nuclear targets and subsequent in-medium decay into e⁺e^- pairs. The quantum interference of ϱ- and ω-mesons in the e⁺e^- channel and the interference between Bethe-Heitler pairs and dielectrons from vector meson decays are of particular interest.