Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-02-02
Eur.Phys.J. C32 (2003) 347-375
Physics
High Energy Physics
High Energy Physics - Phenomenology
50 pages LaTeX, 7 figures, 3 tables, page style fixed
Scientific paper
10.1140/epjc/s2003-01415-x
We consider the hard leptoproduction of a photon off nuclei up to spin-1. As a new result we present here the general azimuthal angular dependence of the differential cross section for a spin-1 target. Its twist-two Fourier coefficients of the interference and squared deeply virtual Compton scattering amplitude are evaluated in leading order approximation of perturbation theory in terms of generalized parton distributions, while the pure Bethe--Heitler cross section is exactly calculated in terms of electromagnetic form factors. Relying on a simple model for the nucleon generalized parton distribution $H$, which describes the existing DVCS data for a proton target, we estimate the size of unpolarized cross sections, beam and longitudinal target spin as well as unpolarized charge asymmetries for present fixed target experiments with nuclei. These estimates are confronted with preliminary HERMES data for deuterium and neon.
Kirchner Alois
Muller Daniel
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