2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204605We present the gluon-gluon and photon-gluon helicity amplitudes for color singlet and octet charmonium production in polarized and unpolarized hadron-hadron and photon-hadron collisions.11 pages amstex no figuresHigh Energy Physics - Phenomenologytext