Transversity of quarks and nucleons in SIDIS and Drell Yan

Abstract

We consider the leading and sub-leading twist $T$-odd and even contributions to the $\cos 2\varphi$ azimuthal asymmetry in unpolarized dilepton production in Drell-Yan Scattering and semi-inclusive deep inelastic scattering of pions.

Comments: LaTeX2e, 4 pages, 4 ps figures, uses ws-procs9x6. Contribution to the 16th International Spin Physics Symposium, SPIN2004, October 10-16, 2004, Trieste, Italy