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ATLAS Note
Report number	ATL-PHYS-PROC-2021-089
Title	The impact of ATLAS $V$+jet measurements on PDF fits
Author(s)	Conroy, Eimear Isobel (University of Oxford (GB)) (+)
Corporate Author(s)	The ATLAS collaboration
Collaboration	ATLAS Collaboration
Publication	2021
Imprint	29 Oct 2021
Number of pages	4
In:	50th International Symposium on Multiparticle Dynamics, Pitlochry, United Kingdom, 27 - 31 Jul 2020
Subject category	Particle Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Parton Distribution Functions ; Quantum Chromodynamics ; Vector Bosons ; V+jets ; QCD
Abstract	The production of $W$/$Z$-bosons in association with jets is an important test of perturbative QCD predictions and also yields information about the parton distribution functions (PDFs) of the proton. We present fits to determine PDFs using inclusive $W$/$Z$-boson and $W$/$Z$+jets measurements from the ATLAS experiment at the LHC. The ATLAS measurements are used in combination with deep-inelastic scattering data from HERA. An improved determination of the sea-quark densities at high Bjorken $x$ is seen, 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.