2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47288It is shown that the $A_{ll}$ asymmetry in diffractive $Q \bar Q$ leptoproduction is not small at HERA energies and dependent on the structure of the pomeron couplings and on the masses of produced quarks. The connection of this asymmetry with the non-forward gluon distribution in the proton is discussed.3 pages, latex, 2 PS figures, talk at the lp DESY Working Group meeting during the 2nd Topical Workshop Deep Inelastic Scattering off Polarized Target: Theory Meets Experiment, DESY Zeuthen, September 1-5, 1997High Energy Physics - Phenomenologytext