The Strangest Proton?

TL;DR

This paper provides an improved, high-precision determination of the strange quark distribution in the proton through a comprehensive global QCD analysis incorporating diverse experimental data and advanced theoretical corrections.

Contribution

It introduces a refined global analysis method that includes charm-quark mass effects and a broad set of measurements to better constrain the proton's strange quark content.

Findings

Strangeness is moderately suppressed compared to other light sea quarks.

The analysis achieves a good fit to the diverse dataset.

Inclusion of charm-quark mass corrections improves accuracy.

Abstract

We present an improved determination of the strange quark and anti-quark parton distribution functions of the proton by means of a global QCD analysis that takes into account a comprehensive set of strangeness-sensitive measurements: charm-tagged cross sections for fixed-target neutrino-nucleus deep-inelastic scattering, and cross sections for inclusive gauge-boson production and $W$-boson production in association with light jets or charm quarks at hadron colliders. Our analysis is accurate to next-to-next-to leading order in perturbative QCD where available, and specifically includes charm-quark mass corrections to neutrino-nucleus structure functions. We find that a good overall description of the input dataset can be achieved and that a strangeness moderately suppressed in comparison to the rest of the light sea quarks is strongly favored by the global analysis.