2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38207In the ZEUS experiment at HERA, photoproduction processes have been studied for photon-proton centre-of-mass energies in the range 100 < W_gamma p < 300 GeV and jet transverse energies extending to E_T^jet ~ 70 GeV. The data contribute to our understanding of QCD dynamics, and also provide new constraints on the photon's parton density.7 pages, 12 figures, talk given at ICHEP'98, writeup also available at http://ppewww.ph.gla.ac.uk/preprints/98/05/High Energy Physics - Experimenttext