2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46273The twist--2 contributions to the polarized structure functions in deep inelastic lepton--hadron scattering are calculated including the exchange of weak bosons and using both the operator product expansion and the covariant parton model. A new relation between two structure functions leading to a sequence of new sum rules is found. The light quark mass corrections to the structure functions are derived in lowest order QCD.7 pages Latex, two files and corresponding style files, Contribution to the Proceedings of the International Workshop on Deep Inelastic Scattering, Rome, April, 1996High Energy Physics - Phenomenologytext