Abstract
An analysis of high-energy data on ρ0, ω0 and ϕ0 photoproduction on protons is carried out in the context of the multichannel impact-parameter formalism which had been successfully applied previously to Compton scattering on protons and neutrons providing a unified theoretical description for all these photon-induced diffractive processes. Particular attention has been devoted to the determination of the helicity-flip structure for the asymptotically leading,i.e. Pomeranchuk, part of vector-meson photoproduction amplitudes. The proposedK-matrix description allows the existence of a helicity-flip contribution to Pomeranchuk exchange albeit with unknown coupling strength. ϕ0 photoproduction is especially suited to investigate in detail the nature of the Pomeranchuk coupling in diffractive photoproduction processes since no lower-lying trajectories can contribute here. The analysis lends support to the presence of a substantial helicity-flip contribution for the nucleons in high-energy vector-meson photoproduction which is to be associated with Pomeranchuk exchange.
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