New constraints on the up-quark valence distribution in the proton

TL;DR

This paper uses high-x data from ZEUS to extract the up-quark valence distribution in the proton, providing new insights into its x-dependence and momentum share using Bayesian methods.

Contribution

It introduces Bayesian analysis for parton density extraction and presents new constraints on the up-quark valence distribution at high x.

Findings

New constraints on the up-quark valence distribution

Detailed x-dependence of the up-quark distribution

Quantification of the momentum carried by the up-quark

Abstract

The high-$x$ data from the ZEUS Collaboration are used to extract parton density distributions of the proton deep in the perturbative regime of QCD. The data primarily constrain the up-quark valence distribution and new results are presented on its $x$-dependence as well as on the momentum carried by the up-quark. The results were obtained using Bayesian analysis methods which can serve as a model for future parton density extractions.