Polarized Structure Functions in QCD
Abstract
The hadron spin physics is now one of the most active fields. Especially in the last ten years, a lot of progress have been made both theoretically and experimentally which have considerably improved our knowledge on the spin structure of nucleons. We review the nucleon's polarized structure functions from a view point of the 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 hadroproduction. 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 roles of the QCD equations of motion to derive their sensitivity to the quark-gluon correlation and their anomalous dimensions for the Q^2-evolution.Keywords
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