2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47132We study photoproduction reactions in a polarized ep collider mode of HERA at sqrt(s)=298 GeV. We examine the sensitivity of the cross sections and their asymmetries to the proton's polarized gluon distribution and to the completely unknown parton distributions of longitudinally polarized photons.11 Pages, LaTeX, 6 figures as eps files, talk presented at the Ringberg Workshop on New Trends in HERA Physics, Ringberg Castle, Germany, 25-30 May 1997High Energy Physics - Phenomenologytext