2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39748Some examples of the most recent applications of the NRQCD factorization approach to quarkonium phenomenology are presented. In the first part of the talk the NLO calculations for $\chicj$ and $Υ$ decays rates are compared to the data and the results critically analyzed. In the second part, I show how information on the non-perturbative matrix elements can be extracted from the hadronic fixed-target experiments and eventually used to test their universality.14 pages, 2 figures. Invited talk presented at 5th Workshop on QCD, Villefranche-sur-Mer, France, 3-7 Jan 2000High Energy Physics - Phenomenologytext