2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127987A first evaluation of the polarized valence quark distribution $Δu_v(x)+Δd_v(x)$ from the COMPASS experiment (CERN/SPS) is presented. The data were collected by COMPASS in the years 2002--2004 using a 160 GeV polarized muon beam scattered off a large polarized $^6$LiD target and cover the range $1< Q^2 < 100$ GeV$^2$ and $0.006<x<0.7$. The analysis is based on the difference asymmetry, $A^{h^+ - h^-}$, for hadrons of opposite charges, which gives a direct access to the polarization of valence quarks.Talk given on XV Internetional Workshop on Deep-Inelastic Scattering and Related Subjects, April 16-20, 2007, Munich, GermanyHigh Energy Physics - Experimenttext