Vector-dominance model, partial conservation of the axial-vector current, and the decoupling of πρω

We show that partial conservation of the axial-vector current and vector dominance together imply that gπρω=0. We discuss the relevance of this result to the failure of vector dominance in polarized photoproduction of pions. We also provide a simple interpretation of the ρ-meson mass shift in photoproduction experiments based on unitarity. © 1971 The American Physical Society.SCOPUS: re.j