2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42214The genuine twist-3 quark-gluon contributions to the Generalized Parton Distributions (GPDs) are estimated in the model of the instanton vacuum. These twist-3 effects are found to be parametrically suppressed relative to the ``kinematical'' twist-3 ones due to the small packing fraction of the instanton vacuum. We derive exact sum rules for the twist-3 GPDs.17 pagesHigh Energy Physics - Phenomenologytext