pi and rho loop corrections to omega photoproduction in the resonance   region
  One-loop corrections due to the intermediate $\pi N$ and $\rho N$ states are studied in $\omega$ photoproduction near threshold. Our results show that the coupled-channel effects should be taken into account in extracting reliable nucleon resonance parameters from the forthcoming vector meson photoproduction data in the resonance region. 
Yongseok Oh, T.-S. H. Lee