2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/214920We study the gluon content of a large nucleus (i) in the semi-classical McLerran-Venugopalan model and (ii) in the high energy limit as given by the quantum evolution of the Color Glass Condensate. We give a simple and qualitative description of the Cronin effect and high-pT suppression in proton-nucleus collisions.4 pages, 5 figures, To appear in the Proceedings of International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions (HP2004), Ericeira, Portugal, 4-10 Nov, 2004High Energy Physics - Phenomenologytext