The ATLASpdf21 fit: a novel determination of proton Parton Distribution Functions using ATLAS data

TL;DR

This paper introduces a new determination of proton Parton Distribution Functions by fitting diverse ATLAS LHC measurements combined with HERA data, emphasizing systematic uncertainty correlations and model impacts.

Contribution

It presents a novel PDF fit methodology incorporating extensive ATLAS data and detailed uncertainty analysis, improving the accuracy of proton structure modeling.

Findings

Enhanced precision in proton PDFs from combined ATLAS and HERA data.

Detailed assessment of systematic uncertainty correlations.

Impact of model and parameterization choices on PDF results.

Abstract

We present fits to determine Parton Distribution Functions using a diverse set of measurements from the ATLAS experiment at the LHC, including inclusive $W$ and $Z$ boson production, $t\bar{t}$ production, $W$+jets and $Z$+jets production, inclusive jet production and direct photon production. These ATLAS measurements are used in combination with deep-inelastic scattering data from the electron-proton collider HERA. Particular attention is paid to the correlation of systematic uncertainties within and between the various ATLAS data sets and to the impact of model, theoretical and parameterisation uncertainties.