Presence of the Universal Substructures in the Hadrons -- Constituent Quarks

Abstract

The universality of single-spin asymmetry on inclusive $\pi$-meson production is discussed. This universality can be related to the hadron substructure -- constituent quarks in the frame of the quark model for U-matrix.

4 pages, 3 figures, Presented on X International Workshop on High Energy Spin Physics (SPIN-03), Dubna, September 16-20