Impact of ATLAS $V$ + jets data on PDF fits

TL;DR

This paper introduces a new set of proton PDFs, ATLASepWZVjet20, derived from ATLAS and HERA data at NNLO QCD, improving sea-quark density estimates at high Bjorken x and confirming strange-quark densities.

Contribution

The paper presents a novel PDF set incorporating recent ATLAS and HERA measurements at NNLO, enhancing the understanding of sea-quark distributions in the proton.

Findings

Improved determination of high-x sea-quark densities.

Confirmation of strange-quark density comparable to up and down sea quarks.

Consistent results with previous ATLAS analyses.

Abstract

This proceeding presents a new set of proton parton distribution functions, ATLASepWZVjet20, produced in an analysis at next-to-next-to-leading-order in QCD. The new datasets considered are the ATLAS measurements of $W^{\pm}$ and $Z$ boson production in association with jets in $pp$ collisions at $\sqrt{s}$ = 8 TeV at the LHC with integrated luminosities of 20.2 fb$^{-1}$ and 19.9 fb$^{-1}$ respectively. The analysis also considers the ATLAS measurements of differential $W^{\pm}$ and $Z$ boson production at $\sqrt{s}$ = 7 TeV with an integrated luminosity of 4.6 fb$^{-1}$ and deep-inelastic scattering data from $e^{\pm}p$ collisions at the HERA accelerator. An improved determination of the sea-quark densities at high Bjorken $x$ is shown, while confirming a strange-quark density of similar size as the up-and down-sea quark densities in the range $x\sim$ 0.02 found by previous ATLAS analyses.