Orbiting valence quarks and their influence on the structure functions of the nucleon

Abstract

It is shown that intrinsic orbital motion of the valence quarks has large influences on the spin-dependent as well as the spin-averaged nucleon structure functions. Its connection with the observed ``very small contribution of quark spin to nucleon spin'' and the observed violation of Gottfried sum rule is discussed.

Comments: 10 pages (LaTeX) including 3 figures