2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38008Some recent results from the Fermilab fixed-target experiment E789 on production of charm, charmonium, and beauty are summarized and compared to model predictions. The data indicate that heavy-quark and quarkonium production are not yet entirely understood. The largest discrepancy concerns the rate of $ψ^\prime$ production, which is a factor $\approx$25 above expectations.3 pages, 2 PostScript figuresHigh Energy Physics - Experimenttext