Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-03-12
Phys.Rev. D58 (1998) 114008
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, latex, 10 figures; a few typos are fixed
Scientific paper
10.1103/PhysRevD.58.114008
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.
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