2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/83280We study the mechanism of the $γ$ and $π^0$ enhancement at large transverse momenta in proton-nucleus collisions. A proposed mechanism suggests an increase in the width of the transverse momentum distribution of partons in a semihard process.3 pages, World Scientific style included. Talk presented by G. Papp at the Workshop "Understanding Deconfinement in QCD", ECT*, Trento, 1-13/March, 1999Nuclear Theorytext