A two-component model is developed for diffractive electroproduction of ρ 0 , φ and J/Ψ, based on non-perturbative and perturbative two-gluon exchange. This provides a common kinematical structure for non-perturbative and perturbative effects, and allows the role of the vector-meson vertex functions to be explored independently of the production dynamics. A good global description of the vector-meson data is obtained.
A two-gluon-exchange model incorporating perturbative and non-perturbative effects is presented for ρ electroproduction which provides an excellent description of all current data. This is then used to calculate the contribution from the ρ to deeply virtual Compton scattering via the vector-meson-dominance transition ρ → γ. This is found to be sufficiently large to provide a significant contribution through interference with the perturbative QCD term.
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