Extracting Boer-Mulders functions from $p+D$ Drell-Yan processes

TL;DR

This paper extracts the Boer-Mulders functions for valence and sea quarks from unpolarized proton-deuteron Drell-Yan data and uses them to predict azimuthal asymmetries in various Drell-Yan processes across different experiments.

Contribution

It provides the first extraction of Boer-Mulders functions from $p+D$ data and applies these to predict asymmetries in $pp$ and $par{p}$ Drell-Yan processes.

Findings

Boer-Mulders functions for valence and sea quarks are extracted.

Predicted $ ext{cos} 2 ext{phi}$ asymmetries for $pp$ and $par{p}$ processes.

Results are consistent with existing experimental data.

Abstract

We extract the Boer-Mulders functions of valence and sea quarks in the proton from unpolarized $p+D$ Drell-Yan data measured by the FNAL E866 Collaboration. Using these Boer-Mulders functions, we calculate the $\cos 2 \phi$ asymmetries in unpolarized $pp$ Drell-Yan processes, both for the FNAL E866/NuSea and the BNL Relativistic Heavy Ion Collider (RHIC) experiments. We also estimate the $\cos 2 \phi$ asymmetries in the unpolarized $p\bar{p}$ Drell-Yan processes at GSI.