2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214512I review the present status of two related models addressing scenarios in which the formation of heavy quarkonium states in high energy heavy ion collisions proceed via "off-diagonal" combinations of a quark and an antiquark. The physical process involved belongs to a general class of quark "recombination", although technically the recombining quarks here were never previously bound in a quarkonium state. Features of these processes relevant as a signature of color deconfinement are discussed.6 pages, 8 figures, based on invited plenary talk at Hard Probes 2004, Ericeira, Portugal, November 3-11, 2004, to appear in the proceedingsHigh Energy Physics - Phenomenologytext