Omega photoproduction beyond the resonance region at small u
  Within the meson exchange model we study $\omega$ meson photoproduction at energies above the s channel resonance region. Different model prescriptions for the $\omega{NN}$ vertex function are investigated imposing gauge invariance as well as crossing symmetry. The calculations reproduce the energy dependence of the differential $\omega$ photoproduction cross sections at moderate $|u|$ for $E_\gamma{\le}4.7$ GeV, which previously were discussed as an indication of the hard interaction between the photon and quarks of the nucleon. 
A. Sibirtsev, K. Tsushima and S. Krewald (IKP FZ Juelich, CSSM and   Adelaide Uni. and Georgia Uni.)