Statistical description of the proton spin with a large gluon helicity distribution

TL;DR

This paper revisits quantum statistical parton distributions using recent DIS data, revealing a large gluon polarization that significantly contributes to the proton spin.

Contribution

It provides a new determination of parton distributions incorporating recent data, highlighting the role of gluon polarization in proton spin.

Findings

Large gluon polarization contributes significantly to proton spin

Improved fit to DIS data with updated parton distributions

Quantum statistical approach effectively describes recent experimental results

Abstract

The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering (DIS) experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. We will see that a large gluon polarization emerges, giving a significant contribution to the proton spin.