New positivity bounds are derived for generalized (off-forward) parton distributions using the impact parameter representation. These inequalities are stable under the evolution to higher normalization points. The full set of inequalities is infinite. Several particular cases are considered explicitly.
Virtual Compton scattering in the generalized Bjorken region and positivity bounds on generalized parton distributions
Solution of polynomiality and positivity constraints on generalized parton distributions
Disentangling positivity constraints for generalized parton distributions
