Polarized Structure Functions and the GDH Integral from Lattice QCD

Abstract

The Gerasimov-Drell-Hearn integral $I_{GDH}(Q^2)$, and its relation to polarized nucleon structure functions, is discussed from the lattice perspective. Of particular interest is the variation of $I_{GDH}(Q^2)$ with $Q^2$, and what it may teach us about the origin and magnitude of higher-twist contributions.

Comments: 9 pages, 5 figures; invited talk given at GDH2004, June 2-5, 2004, Norfolk, USA