Spin-Orbit Correlations

Abstract

We summarize the intuitive connection between deformations of parton distributions in impact parameter space and single-spin asymmetries. Lattice results for the $x^2$-moment of the twist-3 polarized parton distribution $g_2(x)$ are used to estimate the average transverse force acting on the active quark in SIDIS in the instant after being struck by the virtual photon.

arXiv comment8 pages, invited talk at `Transversity 2008', Ferrara, Italy, May 2008