2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/160273I discuss exclusive production of the $η'$, $J/ψ$, and $χ_c(0^+)$ mesons in $pp$ and $p \bar p$ collisions at high energies. QCD diffractive mechanisms as well as nondiffractive mechanisms are discussed. Different unintegrated gluon distribution functions (UGDF) are used. Some differential distributions are shown and discussed.7 pages and 6 figures a talk at the "11th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon" (MENU 2007), September 10-14, 2007, Juelich, GermanyNuclear TheoryAstrophysicsHigh Energy Physics - PhenomenologyExclusive Production of Quarkonia in $pp$ and $p \bar p$ Collisions Far from the Thresholdtext