Constraining the gluon PDF at large x with LHC data

TL;DR

This paper investigates how recent LHC data, including jet, Z-boson, and top-pair measurements, constrain the gluon parton distribution function at large momentum fractions, improving our understanding of proton structure.

Contribution

It provides a detailed analysis of the impact of various LHC measurements on the large-x gluon PDF using the NNPDF3.1 set, highlighting the most constraining data.

Findings

ATLAS jet data significantly constrains the gluon PDF at large x.

Z-boson transverse momentum distributions provide complementary constraints.

Top-pair rapidity data also helps refine the gluon distribution at high x.

Abstract

The NNPDF collaboration has recently presented NNPDF3.1, a new determination of the parton distribution functions (PDFs) of the proton including a number of new data, some of which are particularly sensitive to the gluon PDF at large x. In this contribution, we present the results of two new analyses based on NNPDF3.1. First, we study the impact of the ATLAS 2011 7 TeV inclusive jet data on the gluon PDF including different rapidity bins. Second, we quantitatively compare the constraints provided by all measurements sensitive to the large-x gluon PDF, namely inclusive jet cross sections, the transverse momentum distributions of the Z-boson and top-pair rapidity distributions.