2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204304In the framework of the chiral perturbation theory we computed two- and three-loop corrections to the pion parton distributions which posses $δ$-function singularities at x->0. This calculation explicitly demonstrates that in the region of small x ~ mpi^2/(4 pi F)^2 standard ChPT breaks down and one needs resummation of all orders. We give an example of such resummation.10 pages, 7 figuresHigh Energy Physics - PhenomenologyHigh Energy Physics - LatticeNuclear Experimenttext