2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47492I compare current approaches to quarkonium production with regard to what they tell us about quarkonium polarization. Predictions for $J/ψ$ polarization in hadron-hadron and photon-hadron collisions are summarized.6 pages, LaTeX, 3 figures included via epsf.sty, uses sprocl.sty (provided)High Energy Physics - Phenomenologytext