2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44043The processes of open and hidden charm production in $NN$ collisions and of open charm production in $γN$ collisions are studied. The near-threshold cross section is predicted and polarization phenomena are calculated in frame of an effective Lagrangian approach.10 pages 4 figures, Contribution to XVII International Seminar on High Energy Physics Problems, Relativistic Nuclear Physics and Quantum Chromodynamics, Dubna, (Russia) Sept. 27- Oct 2, 2004High Energy Physics - Phenomenologytext