DVCS amplitude in the parton model
  We compute amplitude of deeply virtual Compton scattering in the parton model. We found that the amplitude up to the accuracy O(1/Q) depends on new skewed parton distributions (SPD's). These additional contributions make the DVCS amplitude explicitly transverse. 
M. Penttinen, M.V. Polyakov, A.G.Shuvaev, M. Strikman