2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49236Di-jet photoproduction in polarized ep collisions at HERA is studied as a possible tool to determine the parton content of circularly polarized photons. The concept of the `effective parton density' approximation is extended to the spin-dependent case.5 pages, LaTeX, 3 eps figures, uses amssymb and epsfig styles; Contribution to the Proceedings of the workshop on `Polarized Protons at High Energies - Accelerator Challenges and Physics Opportunities', DESY, Germany, May 1999High Energy Physics - Phenomenologytext