Determination of the parton distribution functions of the proton from ATLAS measurements of differential $W^{\pm }$ and $Z$ boson production in association with jets

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 $\sqrt{s}=8\mathrm{TeV}$ performed by the ATLAS experiment at the LHC with integrated luminosities of $20.2{\mathrm{fb}}^{-1}$ and $19.9{\mathrm{fb}}^{-1}$, respectively. The analysis also considers the ATLAS measurements of differential $W^{\pm }$ and $Z$ boson production at $\sqrt{s}=7\mathrm{TeV}$ with an integrated luminosity of $4.6{\mathrm{fb}}^{-1}$ 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 similar in size to the up- and down-sea-quark densities in the range $x\lesssim 0.02$ found by previous ATLAS analyses.

43 pages in total, author list starts page 28, 11 figures, 4 tables. Published in JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-18

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