 Vector meson dominance

Vector Meson Dominance (VMD) is a theoretical concept in quantum field theory and particle physics that describes how certain processes involving photons can be effectively treated in terms of the exchange of vector mesons. The basic idea is that, under certain conditions, the interaction of photons with hadronic matter can be modeled as being mediated by vector mesons, such as the ρ (rho), ω (omega), and φ (phi) mesons.