2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117654We apply effective field theory techniques to study several heavy quark systems. The topics analysed include the singlet static QCD potential, anomalous dimensions in SCET and a comprehensive study of semi-inclusive radiative heavy quarkonium decays.109 pages, 38 figures. Ph.D. thesis, includes a summary in CatalanHigh Energy Physics - Phenomenologytext