Determination of the parton distribution functions of the proton from ATLAS measurements of differential W± and Z boson production in association with jets

ATLAS Collaboration

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Abstract

This article 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 data sets considered are the measurements of W+ and W boson and Z boson production in association with jets in pp collisions at √s = 8 TeV performed by the ATLAS experiment 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± and Z boson production at √s = 7 TeV with an integrated luminosity of 4.6 fb−1 and deep-inelastic-scattering data from e±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 similar in size to the up- and down-sea-quark densities in the range x ≲ 0.02 found by previous ATLAS analyses.
Original languageEnglish
Article number223
Number of pages44
JournalJHEP
Volume2021
Issue number7
DOIs
Publication statusPublished - 2 Jul 2021

Bibliographical note

41 pages in total, author list starts page 26, 16 figures, 6 tables. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-18

Keywords

  • Hadron-Hadron scattering (experiments)
  • QCD
  • hep-ex

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