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The inclusive A_1,p and hadron double-spin asymmetries A_p^pi+, A_p^pi-,A_p^K+, A_p^K- measured at COMPASS (CERN SPS) in deep-inelastic scattering of apolarized muon beam off a polarized NH_3 solid target are presented. Theresults have been obtained with the full statistics collected in 2007 for thelongitudinal target polarization. Proton asymmetries have been combined withthe published deuteron ones. An evaluation of the non-singlet spin-dependentstructure function g_1^NS(x,Q^2) and its first moment, which confirms thevalidity of the Bjorken sum-rule, is presented. A LO evaluation of polarizedquark densities is also presented. The use of the proton data allows to performa full flavor separation and to extract individual helicity densities of u, d,anti-u, anti-d and s quarks. All sea quark densities are found to be compatiblewith zero in the full range of the measurements.

Measurement of the longitudinal spin structure of the proton by COMPASS