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We develop a general approach to the calculation of target mass and finitet=(p'-p)^2 corrections in hard processes which can be studied in the frameworkof the operator product expansion and involve momentum transfer from theinitial to the final hadron state. Such corrections, which are usually referredto as kinematic, can be defined as contributions of operators of all twiststhat can be reduced to total derivatives of the leading twist operators. As theprincipal result, we provide a set of projection operators that pick up the"kinematic" part of an arbitrary flavor-nonsinglet twist-four operator in QCD.A complete expression is derived for the time-ordered product of twoelectromagnetic currents that includes all kinematic corrections to twist-fouraccuracy. The results are immediately applicable to the studies ofdeeply-virtual Compton scattering, transition gamma^*-> M gamma form factorsand related processes. As a byproduct of this study, we find a series of"genuine" twist-four flavor-nonsinglet quark-antiquark-gluon operators whichhave the same anomalous dimensions as the leading twist quark-antiquarkoperators.

Operator product expansion in QCD in off-forward kinematics: Separation of kinematic and dynamical contributions