ω-meson photoproduction on nucleons in the near-threshold region

Abstract:

The ω-meson photoproduction, γ + p→p + ω, is studied in the framework of a model, containing π-meson exchange in t-channel and nucleon-exchange in s- and u-channels. Considering both ωNN coupling constants in the region of time-like meson four-momenta as the free parameters, we find different sets of solutions for these constants from the existing data on the t-dependence of the differential cross-sections, dσ(γ + p→p + ω)/dt, in the near-threshold region E _γ? 2 GeV. These sets of ωNN coupling constants, corresponding to destructive and constructive π⊗N-interference contributions to dσ/dt can be well distinguished by measurements of beam asymmetry, induced by linear photon polarization.