Leading twist asymmetries in deeply virtual Compton scattering
  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. 
A.V. Belitsky, D. M\"uller, L. Niedermeier, A. Sch\"afer