The $\cos2\phi$ azimuthal asymmetry of unpolarized $p\bar{p}$ collisions at Tevatron

TL;DR

This paper predicts the cos2phi azimuthal asymmetry in unpolarized proton-antiproton collisions at Tevatron, offering insights into the proton's spin structure through the Boer-Mulders function.

Contribution

It provides the first calculation of the cos2phi asymmetry in p-antip collisions, highlighting its potential to reveal the Boer-Mulders function and deepen understanding of nucleon spin structure.

Findings

Predicted azimuthal asymmetry in p-antip collisions at Tevatron.

Suggests data can probe the Boer-Mulders function.

Enhances understanding of nucleon spin structure.

Abstract

We calculate the $\cos2\phi$ azimuthal asymmetry of the unpolarized $p\bar{p}$ Drell-Yan dilepton production process in the $Z$-resonance region at the Tevatron kinematic domain. Such an azimuthal asymmetry can provide additional information about a spin-related new parton distribution function, i.e., the Boer-Mulders function of the proton, compared to the $pp$ process. Therefore the available data of unpolarized proton-antiproton collision at Tevatron can contribute to our study on the spin structure of the nucleon.