Nonforward parton densities and soft mechanism for form factors and wide-angle Compton scattering in QCD

Abstract

We argue that at moderately large momentum transfer -t <10 GeV^2, hadronic form factors and wide-angle Compton scattering amplitudes are dominated by mechanism corresponding to overlap of soft wave functions. We show that the soft contribution in both cases can be described in terms of the same universal nonforward parton densities (ND's) F(x;t), which are the simplest hybrids of the usual parton densities and hadronic form factors. We propose a simple model for ND's possessing required reduction properties. Our model easily reproduces the observed magnitude and the dipole t-dependence of the proton form factor F_1^p(t) in the region 1 GeV^2 < -t < 10 GeV^2. Our results for the wide-angle Compton scattering cross section follow the angular dependence of existing data and are rather close to the data in magnitude.

16 pages, latex, 10 figures; a few typos are fixed

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• Nonforward Parton Distributions
• Measurements of the Meson-Photon Transition Form Factors of Light Pseudoscalar Mesons at Large Momentum Transfer
• Testing the handbag contribution to exclusive virtual Compton scattering
• Transverse Momentum and Sudakov Effects in Exclusive QCD Processes: gamma* gamma pi0 Form Factor
• Optimal Renormalization Scale and Scheme for Exclusive Processes
• The effect of off-diagonal parton distributions in diffractive vector meson electroproduction
• On the Evolution Kernels of Twist 2 Light-Ray Operators for Unpolarized and Polarized Deep Inelastic Scattering
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