Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-20
Prog.Theor.Phys. 101 (1999) 191-242
Physics
High Energy Physics
High Energy Physics - Phenomenology
58 pages, PTPTEX, 4 Postscript figures, psfig.sty and here.sty are required; typos fixed and minor changes in the text. Final
Scientific paper
10.1143/PTP.101.191
Hadron spin physics is now one of the most active fields of physics. Especially in the last ten years, great progress has been made both theoretically and experimentally that has considerably improved our knowledge of the spin structure of nucleons. We review the nucleon's polarized structure functions from the viewpoint of factorization theorems and the gauge invariant, nonlocal light-cone operators in QCD. We discuss a systematic treatment of the polarized structure functions and the corresponding parton distribution functions, which are relevant to inclusive lepto- and hadro-production. We give a detailed analysis of these spin-dependent distribution functions at the twist-2 and twist-3 level, and present various properties and relations satisfied by the parton distributions, which can be derived directly from QCD. We emphasize unique features of higher twist distributions, and the role of the QCD equations of motion to derive their sensitivity to the quark-gluon correlation and their anomalous dimensions for Q^2-evolution.
Kodaira Jiro
Tanaka Kazuhiro
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