2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148957I propose a prescription for separating the high- and low-energy contributions in effective field theories. This prescription allows a relativistic treatment of matter fields in chiral perturbation theory while the power counting remains valid.12 pages, RevTex, one figure, revised version with more detailsHigh Energy Physics - PhenomenologyNuclear Theorytext