Now showing items 1-20 of 134

• #### Alignment of the ATLAS Inner Detector in Run 2 ﻿

(Journal article; Peer reviewed, 2020-12-24)
The performance of the ATLAS Inner Detector alignment has been studied using pp collision data at s√=13TeV collected by the ATLAS experiment during Run 2 (2015–2018) of the Large Hadron Collider (LHC). The goal of the ...
• #### ATLAS data quality operations and performance for 2015–2018 data-taking ﻿

(Journal article; Peer reviewed, 2020-04)
The ATLAS detector at the Large Hadron Collider reads out particle collision data from over 100 million electronic channels at a rate of approximately 100 kHz, with a recording rate for physics events of approximately 1 ...
• #### 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 ...
• #### Combination of searches for Higgs boson pairs in pp collisions at √s=13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-01-10)
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fb−1 of proton–proton collision data at a centre-of-mass energy √s = 13 TeV recorded with the ATLAS detector at the LHC. The ...
• #### Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV ﻿

(Journal article; Peer reviewed, 2020-08)
The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at ...
• #### Combined measurements of Higgs boson production and decay using up to 80  fb−1 of proton-proton collision data at √s=13  TeV collected with the ATLAS experiment ﻿

(Journal article; Peer reviewed, 2020-01-03)
Combined measurements of Higgs boson production cross sections and branching fractions are presented. The combination is based on the analyses of the Higgs boson decay modes H→γγ, ZZ∗, WW∗, ττ, b¯b, μμ, searches for decays ...
• #### 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 ...
• #### CP Properties of Higgs Boson Interactions with Top Quarks in the tt¯ H and tH Processes Using H→γγ with the ATLAS Detector ﻿

(Journal article; Peer reviewed, 2020-08-05)
A study of the charge conjugation and parity (CP) properties of the interaction between the Higgs boson and top quarks is presented. Higgs bosons are identified via the diphoton decay channel (H→γγ), and their production ...
• #### Determination of jet calibration and energy resolution in proton–proton collisions at √s=8TeV using the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020)
The jet energy scale, jet energy resolution, and their systematic uncertainties are measured for jets reconstructed with the ATLAS detector in 2012 using proton–proton data produced at a centre-of-mass energy of 8 TeV with ...
• #### 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 ...
• #### Differential cross-section measurements for the electroweak production of dijets in association with a Z boson in proton–proton collisions at ATLAS ﻿

(Journal article; Peer reviewed, 2021)
Differential cross-section measurements are presented for the electroweak production of two jets in association with a Z boson. These measurements are sensitive to the vector-boson fusion production mechanism and provide ...
• #### Dijet resonance search with weak supervision using √s = 13 TeV pp collisions in the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-09-21)
This Letter describes a search for narrowly resonant new physics using a machine-learning anomaly detection procedure that does not rely on signal simulations for developing the analysis selection. Weakly supervised learning ...
• #### Electron and photon performance measurements with the ATLAS detector using the 2015-2017 LHC proton-proton collision data ﻿

(Journal article; Peer reviewed, 2019)
This paper describes the reconstruction of electrons and photons with the ATLAS detector, employed for measurements and searches exploiting the complete LHC Run 2 dataset. An improved energy clustering algorithm is introduced, ...
• #### Evidence for electroweak production of two jets in association with a Zγ pair in pp collisions at √s = 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-04-10)
Evidence for electroweak production of two jets in association with a Zγ pair in √s = 13 TeV proton– proton collisions at the Large Hadron Collider is presented. The analysis uses data collected by the ATLAS detector in ...
• #### 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 ...
• #### Evidence for tt¯ tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-11-24)
A search is presented for four-top-quark production using an integrated luminosity of 139 fb−1 of proton–proton collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. Events are ...
• #### 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 ...
• #### Fluctuations of anisotropic flow in Pb+Pb collisions at √sNN = 5.02 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-01-09)
Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb−1 of Pb+Pb collisions at sNN−−−√ = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide ...
• #### Higgs boson production cross-section measurements and their EFT interpretation in the 4 ℓ decay channel at √s= 13 TeV with the ATLAS detector ﻿

(Journal article; Peer reviewed, 2020-10)
Higgs boson properties are studied in the four-lepton decay channel (where lepton = e, μ) using 139 fb−1 of proton–proton collision data recorded at s√=13 TeV by the ATLAS experiment at the Large Hadron Collider. The ...
• #### 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 ...