Instantons and Polarized Structure Functions

Abstract

The contribution of the quark-quark and quark-gluon interaction induced by instantons to the valence quark and proton spin-dependent structure functions $g_1(x,Q^2)$ is estimated within the instanton liquid model for QCD vacuum. It is shown, that this interaction leads to a rather large violation of the Ellis-Jaffe sum rule.

Comments: 9 pages, Latex, 4 figures. To appear in Proc. Workshop "Deep Inelastic Scattering off Polarized Targets: Theory Meets Experiment", September 1997, DESY-Zeuthen