2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226492The NRQCD factorization approach for quarkonium production at hadron colliders is reviewed. The prediction of J/psi and psi(2S) transverse polarization at large transverse momentum is confronted with recent experimental data, and potential shortcomings of the theoretical analysis are discussed.6 pages, 4 figures. Talk presented at the 4th International Conference on Hyperons, Charm and Beauty Hadrons, Valencia, Spain, 27-30 June 2000. To be published in the proceedings. Revised version has updated reference sectionHigh Energy Physics - Phenomenologytext