Finite-t and target mass corrections to deeply virtual Compton scattering
Abstract
We carry out the first complete calculation of kinematic power corrections ~t/Q2 and ~m2/Q2 to the helicity amplitudes of deeply virtual Compton scattering. This result removes an important source of uncertainties in the QCD predictions for intermediate momentum transfers Q2 ~ 1-10 GeV2 that are accessible in the existing and planned experiments. In particular the finite-t corrections are significant and must be taken into account in the data analysis.
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