2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39881Heavy quark bound state systems, mesons and hybrids, are discussed in the framework of the QCD effective field theory called potential Non-Relativistic QCD.13 pages, sprocl.sty, Talk given at the Fourth Workshop on Continuous Advances in QCD, Minneapolis (MN), May 12-14, 2000; corrected some typos in one equation and in the referencesHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext