NLO QCD procedure of the SIDIS data analysis with respect to light quark polarized sea
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The semi-inclusive deep inelastic scattering (SIDIS) process is considered. It is proposed a theoretical procedure allowing the direct extraction from the SIDIS data of the first moments of the polarized valence distributions and of the first moment difference of the light sea quark polarized distributions in the next to leading (NLO) QCD order. The validity of the procedure is confirmed by the respective simulations.