Vector Meson Photoproduction, Amplitude Structure and S-Channel Helicity Conservation Violation in Pomeron Exchange Reactions

The experimental data on vector meson photoproduction and Compton scattering is analyzed by utilizing the dual absorptive model. The s‐channel helicity conserving (SHC) Pomeron exchange amplitude in ρo and φ photoproduction is found to shrink with s, in the same way as in π‐ and K+‐nucleon elastic scattering. The small SHC‐violating amplitudes are also studied. The ratio of amplitudes for ∣Dgr;λ∣ = 1 to Δλ = 0 at the γ‐ρ vertex is shown to be similar to the ratio of corresponding πN amplitudes at the proton vertex and both seem to depend only weakly on s.