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• The ATLAS Fast TracKer system ﻿

(Journal article; Peer reviewed, 2021)
The ATLAS Fast TracKer (FTK) was designed to provide full tracking for the ATLAS high-level trigger by using pattern recognition based on Associative Memory (AM) chips and fitting in high-speed field programmable gate ...
• Configuration and performance of the ATLAS b-jet triggers in Run 2 ﻿

(Journal article; Peer reviewed, 2021)
Several improvements to the ATLAS triggers used to identify jets containing b-hadrons (b-jets) were implemented for data-taking during Run 2 of the Large Hadron Collider from 2016 to 2018. These changes include reconfiguring ...
• Determination of the parton distribution functions of the proton from ATLAS measurements of differential W± and Z boson production in association with jets ﻿

(Journal article; Peer reviewed, 2021)
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 ...
• Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
A search for the Higgs boson decaying into a photon and a pair of electrons or muons with an invariant mass mℓℓ<30 GeV is presented. The analysis is performed using 139 fb−1 of proton–proton collision data, produced by the ...
• Exclusive dimuon production in ultraperipheral Pb+Pb collisions at √sNN=5.02 TeV with ATLAS ﻿

(Journal article; Peer reviewed, 2021)
Exclusive dimuon production in ultraperipheral collisions (UPC), resulting from photon-photon interactions in the strong electromagnetic fields of colliding high-energy lead nuclei, PbPb(γ γ ) → μ+μ−(Pb() Pb() ), is studied ...
• Jet energy scale and resolution measured in proton–proton collisions at $\sqrt{s}=13$ TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
Jet energy scale and resolution measurements with their associated uncertainties are reported for jets using 36–81 fb$^{-1}$ of proton–proton collision data with a centre-of-mass energy of $\sqrt{s}=13$ \({\text ...
• Longitudinal Flow Decorrelations in Xe+Xe Collisions at √sNN =5.44 TeV with the ATLAS Detector ﻿

(Journal article; Peer reviewed, 2021)
The first measurement of longitudinal decorrelations of harmonic flow amplitudes vn for n=2–4 in Xe+Xe collisions at √sNN=5.44 TeV is obtained using 3 μb−1 of data with the ATLAS detector at the LHC. The decorrelation ...
• Measurement of b-quark fragmentation properties in jets using the decay B± → J/ψK± in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
The fragmentation properties of jets containing b-hadrons are studied using charged B mesons in 139 fb−1 of pp collisions at √s = 13 TeV, recorded with the ATLAS detector at the LHC during the period from 2015 to 2018. The ...
• Measurement of light-by-light scattering and search for axion-like particles with 2.2 nb^−1 of Pb+Pb data with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
This paper describes a measurement of light-by-light scattering based on Pb+Pb collision data recorded by the ATLAS experiment during Run 2 of the LHC. The study uses 2.2 nb−1 of integrated luminosity collected in 2015 and ...
• Measurement of single top-quark production in association with a W boson in the single-lepton channel at √s = 8 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
The production cross-section of a top quark in association with a W boson is measured using proton–proton collisions at √s=8TeV. The dataset corresponds to an integrated luminosity of 20.2fb^−1, and was collected in 2012 ...
• Measurement of the associated production of a Higgs boson decaying into b-quarks with a vector boson at high transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
The associated production of a Higgs boson with a W or Z boson decaying into leptons and where the Higgs boson decays to a b¯ b pair is measured in the high vector-boson transverse momentum regime, above 250 GeV, with the ...
• Measurement of the CP-violating phase ϕs in B0s→J/ψϕ decays in ATLAS at 13 TeV ﻿

(Journal article; Peer reviewed, 2021)
A measurement of the B0s→J/ψϕ decay parameters using 80.5fb−1 of integrated luminosity collected with the ATLAS detector from 13 TeV proton–proton collisions at the LHC is presented. The measured parameters include the ...
• Measurement of the jet mass in high transverse momentum Z(→bb‾)γ production at √s=13TeV using the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
The integrated fiducial cross-section and unfolded differential jet mass spectrum of high transverse momentum Z → bb decays are measured in Zγ events in proton–proton collisions at √s = 13 TeV. The data analysed were ...
• Measurement of the production cross section of pairs of isolated photons in pp collisions at 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
A measurement of prompt photon-pair production in proton-proton collisions at √s = 13 TeV is presented. The data were recorded by the ATLAS detector at the LHC with an integrated luminosity of 139 fb−1. Events with two ...
• Measurement of the relative B±c/B± production cross section with the ATLAS detector at √s=8  TeV ﻿

(Journal article; Peer reviewed, 2021)
The total cross section and differential cross sections for the production of B±c mesons, times their branching fraction to J/ψπ±, are measured relative to those for the production of B± mesons, times their branching ...
• Measurement of the tt¯ tt¯ production cross section in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
A measurement of four-top-quark production using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of ...
• Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
Measurements of four-lepton differential and integrated fiducial cross-sections in events with two same-flavour, opposite-charge electron or muon pairs are presented. The data correspond to 139 fb−1 of √s = 13 TeV proton-proton ...
• Measurements of Higgs bosons decaying to bottom quarks from vector boson fusion production with the ATLAS experiment at √s=13TeV ﻿

(Journal article; Peer reviewed, 2021)
The paper presents a measurement of the Standard Model Higgs Boson decaying to b-quark pairs in the vector boson fusion (VBF) production mode. A sample corresponding to 126 fb−1 of √s=13TeV proton–proton collision data, ...
• Measurements of sensor radiation damage in the ATLAS inner detector using leakage currents ﻿

(Journal article; Peer reviewed, 2021)
Non-ionizing energy loss causes bulk damage to the silicon sensors of the ATLAS pixel and strip detectors. This damage has important implications for data-taking operations, charged-particle track reconstruction, detector ...
• Measurements of the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
Measurements of both the inclusive and differential production cross sections of a top-quark–antiquark pair in association with a Z boson (tt¯Ztt¯Z) are presented. The measurements are performed by targeting final states ...