2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/202629We perform a quenched lattice calculation of the first moment of twist-two generalized parton distribution functions of the proton, and assess the total quark (spin and orbital angular momentum) contribution to the spin of the proton.11 pages, 4 figures; final version, to be published in Phys. Rev. LettHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext