The Boer-Mulders Function: Models and Universality

The sign of the Boer-Mulders function $h_1^\perp$ is related to the sign of the GPD $\bar{E}_T$ through the mechanism of chromodynamic lensing. Model calculations of the sign of $\bar{E}_T$ indicate that the sign of $h_1^\perp$ may be the same in all ground state hadrons.
Comment: 6 pages, 1 figure, talk at the "LIGHT CONE 2008: Relativistic Nuclear and Particle Physics" conference, Mulhouse, France, July 7-11, 2008