2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47357We discuss the potential of polarized HERA to measure the spin dependent part of the total photoproduction cross-section at large $\sqrt{s_{γp}}$.7 pages, LaTeX, 1 figure generated as fig1.tex. To appear in Proc. Workshop on ``Physics with Polarized Protons at HERA''High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext