2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46409Longitudinal polarization of the HERA electron beam allows the study of spatial asymmetries in the final state of single inclusive hadron production in $\vec{e}p$-collisions. We estimate the size of a particular production asymmetry which is related to the time reversal properties of the underlying parton level subprocess.2 pages, LaTeX, 1 figure included, Contribution to the proceedings of the "Future Physics at HERA"-workshop, DESY, Hamburg, 1995/96High Energy Physics - Phenomenologytext