Leading twist asymmetries in deeply virtual Compton scattering

Abstract

We calculate spin, charge, and azimuthal asymmetries in deeply virtual Compton scattering at leading twist-two level. The measurement of these asymmetries gives an access to the imaginary and real part of all deeply virtual Compton scattering amplitudes. We note that a consistent description of this process requires taking into account twist-three contributions and give then a model dependent estimate of these asymmetries.

Comments: 21 pages, LaTeX, 4 figures, typos in Eqs. 18, 41 and 49 corrected, references updated