The Quark Contribution to the Nucleon Spin from Polarized Lepton-Nucleon DIS with Neutral Current

Abstract

The expressions for the contributions (u,d,s) quark flavours and valence quarks to nucleon spin in terms the first moments of spin-dependent electroweak structure functions DIS polarized leptons off polarized protons and deuterons through neutral current were obtained. Their numerical evaluations are presented for COMPASS deuteron data.