2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204622We study the pp \to ppπ^0 reaction near threshold based on heavy-baryon chiral perturbation theory. We show that the two-pion-exchange diagrams give much larger contribution than the one-pion-exchange diagram which is of lower chiral order in Weinberg's counting scheme. We also discuss the relation of our results to the momentum counting scheme.talk at MENU 2007 conference, 8 pages, 1 figure, to appear in the proceedingsNuclear Theorytext