Nonforward parton distributions
Nonforward parton distributions
Applications of perturbative QCD to deeply virtual Compton scattering and hard exclusive electroproduction processes require a generalization of usual parton distributions for the case when long-distance information is accumulated in nonforward matrix elements $〈{p}^{\ensuremath{'}}|\mathcal{O}(0,z)|p〉$ of quark and gluon light-cone operators. We describe two types of nonperturbative functions parametrizing such matrix …