2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45608We calculate the longitudinal contribution to the alignment polarization $\Pl$ of quarks produced in $e^+e^-$ annihilation. In the Standard Model, the longitudinal alignment polarization vanishes at the Born term level and thus receives its first non-zero contribution from the $O(\as)$ tree graph process. We provide analytical and numerical results for the longitudinal alignment polarization of massless and massive quarks, in particular for the recently discovered top quark.18 pages, LaTeX, 6 figures are included in uuencoded PostScript formatHigh Energy Physics - Phenomenologytext