2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/147986While EMC-SMC-E142 data sheds new light on the behavior of polarized parton distributions at small and intermediate $x$, it may be also interesting to study valence quark polarizations at large $x$, where spectator quark counting rules and Carlitz-Kaur type models predict different behavior for down quark polarizations. The article examines the possibility of testing the ratio $Δd_V(x)/d_V(x)$ at $x\to 1$ in the inclusive production of $W^{-}$-bosons.LaTeX file, 9 pages, 2 figures inserted using EPSF.STY; in the final version of the preprint a reference to the earlier papers is added and small corrections to the text are madeHigh Energy Physics - Phenomenologytext