2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49347We discuss heavy quarkonium in the framework of pNRQCD, a QCD effective theory appropriate for the study of heavy quark bound systems.3 pages, latex (moriond.sty). Talk given at the XIth Rencontres de Blois, devoted to 'Frontiers of matter', Blois, June 27-July 3, 1999High Energy Physics - Phenomenologytext