2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37695Measurements of the suppression of the yield per nucleon and differential distributions of $J / ψ$ production for 920 GeV/c protons incident on heavy nuclear targets have been made with broad coverage in $p_T$ and negative coverage in $x_F$ of produced meson. Production ratios of $ψ(2S)$ to $J / ψ$ and $χ_c$ to $J / ψ$ have been measured with a high accuracy. The $D^+$ and $D^0$ production cross sections as well as $D^+$ to $D^0$ ratio have been obtained on one of the highest statistics available in proton nucleus experiments.8 pages, 15 figures, Proceedings of the XXXVIIIth Rencontres de Moriond, QCD and Hadronic InteractionsHigh Energy Physics - Experimenttext