Omega photoproduction beyond the resonance region at small u

Abstract

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.

Comments: 8 pages, 7 figures, RevTeX4