B. Abbott's research while affiliated with University of Oklahoma and other places
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Publications (446)
![The μ\documentclass[12pt]{minimal} \usepackage{amsmath}...](publication/358163965/figure/fig1/AS:1117062827130882@1643339940371/The-mdocumentclass12ptminimal-usepackageamsmath-usepackagewasysym_Q320.jpg)
The accurate simulation of additional interactions at the ATLAS experiment for the analysis of proton–proton collisions delivered by the Large Hadron Collider presents a significant challenge to the computing resources. During the LHC Run 2 (2015–2018), there were up to 70 inelastic interactions per bunch crossing, which need to be accounted for in...
Prospects for searches of anomalous quartic gauge couplings at a future high-energy muon collider using the production of $\mathrm{WW}$ boson pairs are reported. Muon-muon collision events are simulated at $\sqrt{s}=6$ TeV corresponding to an integrated luminosity of $4$ ab$^{-1}$. The simulated events are used to study the $\mathrm{W}\mathrm{W}\nu...
![Granularity of the electromagnetic barrel LAr calorimeters [12]. The...](publication/359186241/figure/fig1/AS:11431281085163573@1663640860274/Granularity-of-the-electromagnetic-barrel-LAr-calorimeters-12-The-accordion-geometry_Q320.jpg)
The ATLAS experiment at the Large Hadron Collider has a broad physics programme ranging from precision measurements to direct searches for new particles and new interactions, requiring ever larger and ever more accurate datasets of simulated Monte Carlo events. Detector simulation with Geant4 is accurate but requires significant CPU resources. Over...
During LHC Run 2 (2015–2018) the ATLAS Level-1 topological trigger allowed efficient data-taking by the ATLAS experiment at luminosities up to 2.1×1034 cm-2s-1, which exceeds the design value by a factor of two. The system was installed in 2016 and operated in 2017 and 2018. It uses Field Programmable Gate Array processors to select interesting eve...
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 s=13 TeV collected by the ATLAS detector at the LHC. Jets are reconstructed using two different input types: topo-clusters formed from energy deposits in calorimeter...
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 s = 8 TeV performed by the ATLAS experiment at the LHC wit...
This article documents the muon reconstruction and identification efficiency obtained by the ATLAS experiment for 139 fb-1 of pp collision data at s=13 TeV collected between 2015 and 2018 during Run 2 of the LHC. The increased instantaneous luminosity delivered by the LHC over this period required a reoptimisation of the criteria for the identifica...
A search for charged Higgs bosons decaying into W±W± or W±Z bosons is performed, involving experimental signatures with two leptons of the same charge, or three or four leptons with a variety of charge combinations, missing transverse momentum and jets. A data sample of proton-proton collisions at a centre-of-mass energy of 13 TeV recorded with the...
A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139fb-1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on the final...
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 a fundamental test of the gauge structure of the Standard Model. The analysis is performed using proton–proton collision data col...
A bstract
Differential cross-sections are measured for top-quark pair production in the all-hadronic decay mode, using proton-proton collision events collected by the ATLAS experiment in which all six decay jets are separately resolved. Absolute and normalised single- and double-differential cross-sections are measured at particle and parton level...
One correction is noted for the paper. A wrong cross-section was used for the theory prediction in figure 6 due to not taking into account the VHH contamination properly in the rescaling formula for the signal samples.
This paper presents a search for direct top squark pair production in events with missing transverse momentum plus either a pair of jets consistent with Standard Model Higgs boson decay into b-quarks or a same-flavour opposite-sign dilepton pair with an invariant mass consistent with a Z boson. The analysis is performed using the proton–proton coll...
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 13TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and e...
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 inclusive cross-section times branching ratio for H→ZZ∗ decay is measured to be 1.34±0.12 pb for a Higgs boson with absolute rapidity...
A search for direct pair production of scalar partners of the top quark (top squarks or scalar third-generation up-type leptoquarks) in the all-hadronic \(t{\bar{t}}\) plus missing transverse momentum final state is presented. The analysis of 139 \(\hbox {fb}^{-1}\) of \({\sqrt{s}=13}\) TeV proton–proton collision data collected using the ATLAS det...
A measurement of observables sensitive to spin correlations in \(t\bar{t}\) production is presented, using 36.1 \(\hbox {fb}^{-1}\) of pp collision data at \(\sqrt{s} = 13\) TeV recorded with the ATLAS detector at the Large Hadron Collider. Differential cross-sections are measured in events with exactly one electron and one muon with opposite-sign...
A bstract
Single top-quark production in association with a Z boson, where the Z boson decays to a pair of charged leptons, is measured in the trilepton channel. The proton-proton collision data collected by the ATLAS experiment from 2015 to 2018 at a centre-of-mass energy of 13 TeV are used, corresponding to an integrated luminosity of 139 fb − 1...
This paper describes precision measurements of the transverse momentum \(p_\mathrm {T}^{\ell \ell }\) (\(\ell =e,\mu \)) and of the angular variable \(\phi ^{*}_{\eta }\) distributions of Drell–Yan lepton pairs in a mass range of 66–116 GeV. The analysis uses data from 36.1 fb\(^{-1}\) of proton–proton collisions at a centre-of-mass energy of \(\sq...
A bstract
This paper presents a measurement of the production cross-section of a Z boson in association with b -jets, in proton-proton collisions at $$ \sqrt{s} $$ s = 13 TeV with the ATLAS experiment at the Large Hadron Collider using data corresponding to an integrated luminosity of 35.6 fb − 1 . Inclusive and differential cross-sections are meas...
A bstract
A search for Higgs boson pair production via vector-boson fusion (VBF) in the $$ b\overline{b}b\overline{b} $$ b b ¯ b b ¯ final state is carried out with the ATLAS experiment using 126 fb − 1 of proton- proton collision data delivered at $$ \sqrt{s} $$ s = 13 TeV by the Large Hadron Collider. This search is sensitive to VBF production of...
A search for supersymmetric partners of gluons and quarks is presented, involving signatures with jets and either two isolated leptons (electrons or muons) with the same electric charge, or at least three isolated leptons. A data sample of proton-proton collisions at \( \sqrt{s} \) = 13 TeV recorded with the ATLAS detector at the Large Hadron Colli...
The inclusive top quark pair (\(t\bar{t}\)) production cross-section \(\sigma _{t\bar{t}}\) has been measured in proton–proton collisions at \(\sqrt{s}=13\,\text {TeV}\), using 36.1 fb\(^{-1}\) of data collected in 2015–2016 by the ATLAS experiment at the LHC. Using events with an opposite-charge \(e\mu \) pair and b-tagged jets, the cross-section...
A search for dijet resonances in events with at least one isolated charged lepon is performed using 139 fb−1 of \( \sqrt{s} \) = 13 TeV proton-proton collision data recorded by the ATLAS detector at the LHC. The dijet invariant-mass (mjj) distribution constructed from events with at least one isolated electron or muon is searched in the region 0.22...
A bstract
A search for new resonances decaying into a pair of jets is reported using the dataset of proton-proton collisions recorded at $$ \sqrt{s} $$ s = 13 TeV with the ATLAS detector at the Large Hadron Collider between 2015 and 2018, corresponding to an integrated luminosity of 139 fb − 1 . The distribution of the invariant mass of the two lea...
Multi-particle azimuthal cumulants are measured as a function of centrality and transverse momentum using 470 μb⁻¹ of Pb+Pb collisions at \( \sqrt{s_{\mathrm{NN}}} \) = 5.02 TeV with the ATLAS detector at the LHC. These cumulants provide information on the event-by-event fluctuations of harmonic flow coefficients vn and correlated fluctuations betw...
A measurement of the production of a prompt J/ψ meson in association with a W± boson with W± → μν and J/ψ → μ⁺μ⁻ is presented for J/ψ transverse momenta in the range 8.5–150 GeV and rapidity |yJ/ψ| < 2.1 using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of \( \sqrt{s} \) = 8 TeV and correspon...
The azimuthal anisotropy of charged particles produced in \(\sqrt{s_{\mathrm {NN}}}=8.16\) TeV p+Pb collisions is measured with the ATLAS detector at the LHC. The data correspond to an integrated luminosity of 165 \(\mathrm {nb}^{-1}\) that was collected in 2016. Azimuthal anisotropy coefficients, elliptic \(v_2\) and triangular \(v_3\), extracted...
Measurements of \(K_S^0\) and \(\Lambda ^0\) production in \(t\bar{t}\) final states have been performed. They are based on a data sample with integrated luminosity of 4.6 \(\mathrm {fb}^{-1}\) from proton–proton collisions at a centre-of-mass energy of 7 TeV, collected in 2011 with the ATLAS detector at the Large Hadron Collider. Neutral strange p...
To assess the properties of the quark–gluon plasma formed in ultrarelativistic ion collisions, the ATLAS experiment at the LHC measures a correlation between the mean transverse momentum and the flow harmonics. The analysis uses data samples of lead–lead and proton–lead collisions obtained at the centre-of-mass energy per nucleon pair of 5.02 TeV,...
Abstract Single- and double-differential cross-section measurements are presented for the production of top-quark pairs, in the lepton + jets channel at particle and parton level. Two topologies, resolved and boosted, are considered and the results are presented as a function of several kinematic variables characterising the top and $$t\bar{t}$$ tt...
A bstract
The result of a search for the pair production of the lightest supersymmetric partner of the bottom quark $$ \left({\tilde{b}}_1\right) $$ b ˜ 1 using 139 fb − 1 of proton-proton data collected at $$ \sqrt{s} $$ s = 13 TeV by the ATLAS detector is reported. In the supersymmetric scenarios considered both of the bottom-squarks decay into a...
Abstract The production cross-sections for $$W^{\pm }$$ W± and Z bosons are measured using ATLAS data corresponding to an integrated luminosity of 4.0 pb$$^{-1}$$ -1 collected at a centre-of-mass energy $$\sqrt{s}=2.76$$ s=2.76 TeV. The decay channels $$W \rightarrow \ell \nu $$ W→ℓν and $$Z \rightarrow \ell \ell $$ Z→ℓℓ are used, where $$\ell $$ ℓ...
The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelih...
A bstract
A determination of the top-quark mass is presented using 20.2 fb − 1 of 8 TeV proton-proton collision data produced by the Large Hadron Collider and collected by the ATLAS experiment. The normalised differential cross section of top-quark pair production in association with an energetic jet is measured in the lepton+jets final state and u...
A measurement of \(W^\pm \) boson production in Pb+Pb collisions at \(\sqrt{s_\mathrm {NN}} = 5.02~\text {Te}\text {V}\) is reported using data recorded by the ATLAS experiment at the LHC in 2015, corresponding to a total integrated luminosity of \(0.49\;\mathrm {nb^{-1}}\). The \(W^\pm \) bosons are reconstructed in the electron or muon leptonic d...
A bstract
The problems of neutrino masses, matter-antimatter asymmetry, and dark matter could be successfully addressed by postulating right-handed neutrinos with Majorana masses below the electroweak scale. In this work, leptonic decays of W bosons extracted from 32.9 fb − 1 to 36.1 fb − 1 of 13 TeV proton–proton collisions at the LHC are used to...
A bstract
This paper presents a measurement of ZZ production with the ATLAS detector at the Large Hadron Collider. The measurement is carried out in the final state with two charged leptons and two neutrinos, using data collected during 2015 and 2016 in pp collisions at $$ \sqrt{s} $$ s = 13 TeV, corresponding to an integrated luminosity of 36.1 fb...
This paper describes a study of techniques for identifying Higgs bosons at high transverse momenta decaying into bottom-quark pairs, H→bb¯, for proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy s=13 TeV. These decays are reconstructed from calorimeter jets found with the anti-ktR=1....
A bstract
The differential cross section for isolated-photon production in pp collisions is measured at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 36 . 1 fb − 1 . The differential cross section is presented as a function of the photon transverse energy in different regions of photon pseudo...
A bstract
Narrow resonances decaying into W W , W Z or ZZ boson pairs are searched for in 139 fb − 1 of proton-proton collision data at a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018. The diboson system is reconstructed using pairs of high transverse momentum, lar...
This paper presents measurements of the \(W^+ \rightarrow \mu ^+\nu \) and \(W^- \rightarrow \mu ^-\nu \) cross-sections and the associated charge asymmetry as a function of the absolute pseudorapidity of the decay muon. The data were collected in proton–proton collisions at a centre-of-mass energy of 8 \(\text {TeV}\) with the ATLAS experiment at...
One correction is made to the figure 4e of the paper.
The inclusive production rates of isolated, prompt photons in p+Pb collisions at sNN=8.16 TeV are studied with the ATLAS detector at the Large Hadron Collider using a dataset with an integrated luminosity of 165 nb−1 recorded in 2016. The cross-section and nuclear modification factor RpPb are measured as a function of photon transverse energy from...
A bstract
A search for a narrow scalar resonance decaying into an opposite-sign muon pair produced in events with and without b -tagged jets is presented in this paper. The search uses 36.1 fb ⁻¹ of $$ \sqrt{s}=13 $$ s = 13 TeV proton-proton collision data recorded by the ATLAS experiment at the LHC. No significant excess of events above the expect...
This paper presents measurements of \(W^{\pm }Z\) production cross sections in pp collisions at a centre-of-mass energy of 13 \(\text {TeV}\). The data were collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider, and correspond to an integrated luminosity of \(36.1~\hbox {fb}^{-1}\). The \(W^{\pm }Z\) candidate events are r...
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This paper describes a search for pairs of neutral, long-lived particles decaying in the ATLAS calorimeter. Long-lived particles occur in many extensions to the Standard Model and may elude searches for new promptly decaying particles. The analysis considers neutral, long-lived scalars with masses between 5 and 400 GeV, produced from decays of heav...
A bstract
This paper describes a search for events with one top-quark and large missing transverse momentum in the final state. Data collected during 2015 and 2016 by the ATLAS experiment from 13 TeV proton–proton collisions at the LHC corresponding to an integrated luminosity of 36.1 fb ⁻¹ are used. Two channels are considered, depending on the le...
The performance of identification algorithms (“taggers”) for hadronically decaying top quarks and W bosons in pp collisions at \(\sqrt{s}\) = 13 TeV recorded by the ATLAS experiment at the Large Hadron Collider is presented. A set of techniques based on jet shape observables are studied to determine a set of optimal cut-based taggers for use in phy...
Inclusive and differential cross-sections for the production of a top-quark pair in association with a photon are measured with proton-proton collision data corresponding to an integrated luminosity of 36.1 \(\text{ fb }^{-1}\), collected by the ATLAS detector at the LHC in 2015 and 2016 at a centre-of-mass energy of 13 \(\text {TeV}\). The measure...
A bstract
A search for singly produced vector-like quarks Q , where Q can be either a T quark with charge +2/3 or a Y quark with charge −4/3, is performed in proton–proton collision data at a centre-of-mass energy of 13 TeV corresponding to an integrated luminosity of 36.1 fb ⁻¹ , recorded with the ATLAS detector at the LHC in 2015 and 2016. The an...
A bstract
A search for flavour-changing neutral current decays of a top quark into an up-type quark ( q = u , c ) and the Standard Model Higgs boson, t → Hq , is presented. The search is based on a dataset of pp collisions at $$ \sqrt{s} $$ s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and correspond...
It has been found that the theoretical predictions for W and Z boson cross sections, and for the W boson charge asymmetry, which are labelled as NNPDF3.1 [1] have in fact been calculated using the NNPDF3.0 PDF set [2] instead.
An observation of electroweak W ± Z production in association with two jets in proton–proton collisions is presented. The data collected by the ATLAS detector at the Large Hadron Collider in 2015 and 2016 at a centre-of-mass energy of s=13 TeV are used, corresponding to an integrated luminosity of 36.1fb ⁻¹ . Events containing three identified lept...
A bstract
A search for a pair of neutral, scalar bosons with each decaying into two W bosons is presented using 36.1 fb ⁻¹ of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. This search uses three production models: non-resonant and resonant Higgs boson pair production...
A bstract
Cross-sections of associated production of a Higgs boson decaying into bottomquark pairs and an electroweak gauge boson, W or Z , decaying into leptons are measured as a function of the gauge boson transverse momentum. The measurements are performed in kinematic fiducial volumes defined in the ‘simplified template cross-section’ framework...
A bstract
A search for Higgs boson pair production in the $$ b\overline{b}W{W}^{*} $$ b b ¯ W W * decay mode is performed in the $$ b\overline{b}\mathit{\ell \nu qq} $$ b b ¯ ℓνqq final state using 36.1 fb ⁻¹ of proton-proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider. No eviden...
