Towards a Direct Measurement of the Quark Orbital Angular Momentum Distribution

Abstract

We discuss two different definitions of partonic orbital angular momentum given in the literature in terms of the Fourier transform of a Wigner distribution, $F_{14}$, and a twist three generalized parton distribution, ${\tilde{E}}_{2T}$, respectively. We derive a relation between the two definitions which reflects their specific spin and intrinsic transverse momentum/transverse space correlations as well as their gauge link structure.

Comments: 7 pages, presented at XXIII International Workshop on Deep-Inelastic Scattering, 27 April - May 1 2015, Dallas, Texas