Novel Azimuthal Asymmetries in Drell Yan and Semi-inclusive Deep Inelastic Scattering

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. We estimate the contributions' effects at $500\mathrm{GeV}$, $50\mathrm{GeV}$, and $25\mathrm{GeV}$ energies in the framework of the parton model using a quark diquark-spectator model of the nucleon to approximate the soft contributions.

Comments: 6 pages, 4 figures