Now showing items 1-20 of 48

• #### 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 ...
• #### 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 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 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 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 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 ...
• #### Measurements of W + W −+ ≥ 1 jet production cross-sections in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
Fiducial and differential cross-section measurements of W+W− production in association with at least one hadronic jet are presented. These measurements are sensitive to the properties of electroweak-boson self-interactions ...
• #### Novel 3D Pixel Sensors for the Upgrade of the ATLAS Inner Tracker ﻿

(Journal article; Peer reviewed, 2021)
The ATLAS experiment will undergo a full replacement of its inner detector to face the challenges posed by the High Luminosity upgrade of the Large Hadron Collider (HL-LHC). The new Inner Tracker (ITk) will have to deal ...
• #### Observation of photon-induced W+W− production in pp collisions at √s = 13 TeV using the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
This letter reports the observation of photon-induced production of W -boson pairs, γγ → W W . The analysis uses 139 fb−1 of LHC proton–proton collision data taken at √s = 13 TeV recorded by the ATLAS experiment during the ...
• #### Optimisation of large-radius jet reconstruction for the ATLAS detector in 13 TeV proton–proton collisions ﻿

(Journal article; Peer reviewed, 2021)
Jet substructure has provided new opportunities for searches and measurements at the LHC, and has seen continuous development since the optimization of the large-radius jet definition used by ATLAS was performed during Run ...
• #### Performance of the ATLAS RPC detector and Level-1 muon barrel trigger at √s=13 TeV ﻿

(Journal article; Peer reviewed, 2021)
The ATLAS experiment at the Large Hadron Collider (LHC) employs a trigger system consisting of a first-level hardware trigger (L1) and a software-based high-level trigger. The L1 muon trigger system selects muon candidates, ...
• #### Search for a heavy Higgs boson decaying into a Z boson and another heavy Higgs boson in the ℓℓbb and ℓℓWW final states in pp collisions at √s=13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
A search for a heavy neutral Higgs boson, A, decaying into a Z boson and another heavy Higgs boson, H, is performed using a data sample corresponding to an integrated luminosity of 139 fb−1 from proton–proton collisions ...
• #### Search for bottom-squark pair production in pp collision events at √s=13 TeV with hadronically decaying τ -leptons, b-jets, and missing transverse momentum using the ATLAS detector ﻿

(Journal article; Peer reviewed, 2021)
A search for pair production of bottom squarks in events with hadronically decaying τ-leptons, b-tagged jets, and large missing transverse momentum is presented. The analyzed dataset is based on proton-proton collisions ...