QUARK DISTRIBUTIONS AND NUCLEON SPIN STRUCTURE

Abstract

In this paper we calculate spin dependence of parton distributions and proton structure function. The polarized valon distributions in a proton and the polarized parton distributions inside the valon are necessary to obtain the polarized parton distributions in a proton. The results of our calculations for the proton structure function, [Formula: see text] are in good agreement with the available experimental data. We obtain the spin contribution and angular momentum of the valons to the proton.