Leading-order analysis of the twist-3 space- and time-like cut vertices in QCD

Abstract

We review the recent theoretical progress in the construction and solution of the evolution equations which govern the scale dependence for the twist-three structure and fragmentation functions of the nucleon.

Comments: 49 pages, LaTeX, 13 eps figures; Lecture given at the XXXI PNPI Winter School on Nuclear and Particle Physics, St. Petersburg, Repino, February 24 - March 2, 1997