2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45704It is shown that the longitudinal double spin asymmetry $A_{ll}$ in polarized diffractive $Q \bar Q$ production depends strongly on the spin structure of the quark-pomeron vertex. Relevant experiments will be possible at HERA with a polarized proton beam.8 pages, uuencode PS-file with 5 figures. Represented at the Workshop "Prospects of Spin Physics at HERA", Zeuthen, August 28-31, 1995High Energy Physics - Phenomenologytext