2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/40491Measurements of heavy quark production at a possible future $ep$ facility, THERA, would provide valuable information on the structure of the photon. QCD cross-section predictions are made at LO for both charm and beauty production and their sensitivity to current parametrisations of the photon parton densities is investigated.10 pages, 9 figures. To appear in "The THERA Book", DESY-LC-REV-2001-062. IFT 2001/8High Energy Physics - Phenomenologytext