Updating Boer-Mulders functions from unpolarized pd and pp Drell-Yan data

Abstract

We extract the Boer-Mulders functions for the proton by combining the unpolarized pd and pp Drell-Yan data measured by the E866/NuSea Collaboration by the assumption that the $\cos 2ϕ$ asymmetry is from the Boer-Mulders function. Using the extracted Boer-Mulders functions, we present the predictions for the $\cos 2 ϕ$ asymmetries in future pp experiments at J-PARC and $p \bar{p}$ experiments at PANDA and PAX.

High q_t data excluded in the fit; uncertainty of the fitted parameters given; figures renewed; references added; matches ther version published in Physical Review D.