New Statistical PDFs: Predictions and Tests up to LHC Energies

TL;DR

This paper revisits quantum statistical parton distributions with recent DIS data, improving the global fit and making predictions for high-energy collider processes up to LHC energies.

Contribution

It introduces a refined quantum statistical model for parton distributions based on an expanded data set and performs a comprehensive NLO QCD analysis.

Findings

Good description of structure functions across a broad $x$ and $Q^2$ range

Insights into the behavior of $ar d / ar u$ at large $x$

Predictions for jet production and charge asymmetry at LHC energies

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 experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. This global next-to-leading order QCD analysis leads to a good description of several structure functions, involving unpolarized parton distributions and helicity distributions, in a broad range of $x$ and $Q^2$ and in terms of a rather small number of free parameters. There are several challenging issues, in particular the behavior of $\bar d(x) / \bar u(x)$ at large $x$, a possible large positive gluon helicity distribution, etc.. The predictions of this theoretical approach will be tested for single-jet production and charge asymmetry in $W^{\pm}$ production in $\bar p p$ and $p p$ collisions up to LHC energies, using recent data and also for forthcoming experimental results.