2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/169668In the framework of the $k_T$-factorization approach, the production of Upsilon mesons at the Fermilab Tevatron is considered, and the comparisions of calculated $p_T$-distributions and spin alignment parameter $α$ with the D0 experimental data are shown. We argue that measuring the double cross section and the polarization of upsilonium states can serve as a crucial test discriminating two competing theoretical approaches to parton dynamics in QCD.6 pages, 2 figures, to be published in Proceedings of HSQCD Workshop, Gatchina, 2008High Energy Physics - Phenomenologytext