Now showing items 210-229 of 428

    • Performance of Algorithms that Reconstruct Missing Transverse Momentum in √s̅ = 8 TeV Proton–Proton Collisions in the ATLAS Detector 

      Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Aben, R.; Abolins, M.; Izen, Joseph M.; Meirose, Bernhard; Namasivayam, Harisankar; Leyton, Michael; Reeves, Kendall; ATLAS Collaboration (Springer New York LLC, 2018-05-15)
      Direct searches for lepton flavour violation in decays of the Higgs and Z bosons with the ATLAS detector at the LHC are presented. The following three decays are considered: H → eτ, H →μτ, and Z → μτ. The searches are based ...
    • Performance of the ATLAS Muon Trigger in pp Collisions at √s̅ = 8 TeV 

      Aad, G.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdinov, O.; Aben, R.; Abi, B.; Izen, Joseph M.; Leyton, Michael; Lou, Xinchou; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration (EDP Sciences, 2015-03-13)
      The performance of the ATLAS muon trigger system is evaluated with proton-proton collision data collected in 2012 at the Large Hadron Collider at a centre-of-mass energy of 8 TeV. It is primarily evaluated using events ...
    • Performance of the ATLAS Track Reconstruction Algorithms in Dense Environments in LHC Run 2 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Abidi, S. H.; AbouZeid, O. S.; Izen, Joseph M.; Meirose, Bernhard; Reeves, Kendall; Leyton, Michael; ATLAS Collaboration (Springer New York LLC, 2018-05-15)
      Measurements of the electroweak production of a W boson in association with two jets at high dijet invariant mass are performed using √s̅ = 7 and 8 TeV proton–proton collision data produced by the Large Hadron Collider, ...
    • Performance of the ATLAS Trigger System in 2015 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Aben, R.; Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Reeves, Kendall (Springer New York LLC, 2018-05-15)
      This article presents measurements of tt̅ differential cross-sections in a fiducial phase-space region, using an integrated luminosity of 3.2 fb⁻¹ of proton–proton data at a centre-of-mass energy of √s̅ = 13 TeV recorded ...
    • Precise Measurement of the e⁺e⁻ → π⁺π⁻ (γ) Cross Section with the Initial-State Radiation Method at BABAR 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2012-08-28)
      A precise measurement of the cross section of the process e⁺e⁻ → π⁺π⁻ (γ) from threshold to an energy of 3 GeV is obtained with the initial-state radiation (ISR) method using 232 fb⁻¹ of data collected with the BABAR ...
    • Precision Measurement and Interpretation of Inclusive W⁺ , W⁻ and Z/γ* Production Cross Sections with the ATLAS Detector 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; AbouZeid, O. S.; Izen, Joseph M.; Meirose, Bernhard; Kurth, Matthew G.; Leyton, Michael; Reeves, Kendall; ATLAS Collaboration (2018-05-15)
      ATLAS measurements of two-particle correlations are presented for √s̅ = 5.02 and 13 TeV pp collisions and for √{S_{NN}} = 5.02 TeV p + Pb collisions at the LHC. The correlation functions are measured as a function of ...
    • Precision Measurement of the B→X_sγ Photon Energy Spectrum, Branching Fraction, and Direct CP Asymmetry A_{CP}(B→X_{s+d}γ) 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2012-11-09)
      The photon spectrum in the inclusive electromagnetic radiative decays of the B meson, B→X_sγ plus B→X_dγ, is studied using a data sample of (382.8 ± 4.2)×10⁶Υ(4S) →BB̄ decays collected by the BABAR experiment at SLAC. ...
    • Probing the W tb Vertex Structure in T-Channel Single-Top-Quark Production and Decay in pp Collisions at √s̅ = 8 TeV with the ATLAS Detector 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; AbouZeid, O. S.; Izen, Joseph M.; Meirose, Bernhard; Kurth, Matthew G.; Leyton, Michael; Reeves, Kendall; ATLAS Collaboration (2018-05-15)
      High-precision measurements by the ATLAS Collaboration are presented of inclusive W⁺ → ℓ⁺ν, W⁻ → ℓ⁻ν̅ and Z/γ* → ℓℓ (ℓ = e, μ) Drell-Yan production cross sections at the LHC. The data were collected in proton–proton ...
    • Production and Integration of the ATLAS Insertable B-Layer 

      Abbott, B.; Albert, J.; Alberti, F.; Alex, M.; Alimonti, G.; Alkire, S.; Allport, P.; Izen, Joseph M.; Leyton, Michael; ATLAS Collaboration (IOP Publishing Ltd, 2018-11-05)
      During the shutdown of the CERN Large Hadron Collider in 2013-2014, an additional pixel layer was installed between the existing Pixel detector of the ATLAS experiment and a new, smaller radius beam pipe. The motivation ...
    • Production of Charged Pions, Kaons, and Protons in e⁺e⁻ Annihilations into Hadrons at √s = 10.54 GeV 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Lou, Xinchou; Izen, Joseph M.; BaBar Collaboration (American Physical Society, 2013-08-26)
      Inclusive production cross sections of π^±, K^± and p/p̅ per hadronic e⁺e⁻ annihilation event are measured at a center-of-mass energy of 10.54 GeV, using a relatively small sample of very high quality data from the BABAR ...
    • Properties of g → bb̅ at Small Opening Angles in pp Collisions with the ATLAS Detector at √s =13 TeV 

      Aaboud, M.; Aad, G.; Abbott, B.; Abbott, D. C.; Abdinov, O.; Abeloos, B.; Abhayasinghe, D. K.; Izen, Joseph M.; Reeves, Kendall; ATLAS Collaboration
      The fragmentation of high-energy gluons at small opening angles is largely unconstrained by present measurements. Gluon splitting to b-quark pairs is a unique probe into the properties of gluon fragmentation because ...
    • Reconstruction of Primary Vertices at the ATLAS Experiment in Run 1 Proton–Proton Collisions at the LHC 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Abeloos, B.; Aben, R.; Izen, Joseph M.; Kurth, Matthew G.; Leyton, Michael; Meirose, Bernhard; Reeves, Kendall; ATLAS Collaboration (Springer New York LLC, 2017-05-18)
      During 2015 the ATLAS experiment recorded 3.8 fb⁻¹ of proton–proton collision data at a centre-of-mass energy of 13 TeV. The ATLAS trigger system is a crucial component of the experiment, responsible for selecting events ...
    • Search for a Charged Higgs Boson Produced in the Vector-Boson Fusion Mode with Decay H^(±) → W^(±)Z using pp Collisions at √s=8 TeV with the ATLAS Experiment 

      Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration (Amer Physical Soc, 2015-06-09)
      A search for a charged Higgs boson, H^(±), decaying to a W^(±) boson and a Z boson is presented. The search is based on 20.3 fb⁻¹ of proton-proton collision data at a center-of-mass energy of 8 TeV recorded with the ATLAS ...
    • Search for a Dark Photon in e⁺e⁻ Collisions at Babar 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2014-11-10)
      Dark sectors charged under a new Abelian interaction have recently received much attention in the context of dark matter models. These models introduce a light new mediator, the so-called dark photon (A′), connecting the ...
    • Search for a Heavy Higgs Boson Decaying into a Z Boson and Another Heavy Higgs Boson in the ℓℓbb Final State in pp Collisions at √s=13 TeV with the ATLAS Detector 

      Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B.; Abidi, S. H.; AbouZeid, O. S.; Izen, Joseph M.; Meirose, Bernhard; Reeves, Kendall; ATLAS Collaboration
      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 36.1 fb⁻¹ from proton–proton collisions ...
    • Search for a Heavy Neutral Particle Decaying to εμ, ετ, or μτ in pp Collisions at √s = 8  TeV with the ATLAS Detector 

      Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration (American Physical Society, 2015-07-14)
      This Letter presents a search for a heavy neutral particle decaying into an opposite-sign different-flavor dilepton pair, e^{±}μ^{∓}, e^{±}τ^{∓}, or μ^{±}τ^{∓} using 20.3 fb⁻¹ of pp collision data at √s̅ = 8  TeV collected ...
    • Search for a High-Mass Higgs Boson Decaying to a W Boson Pair in pp Collisions at √s̅ = 8 TeV with the ATLAS Detector 

      Aad, G.; Abbott, B.; Abdallah, J.; Abdinov, O.; Aben, R.; Abolins, M.; AbouZeid, O. S.; Izen, Joseph M.; Leyton, Michael; Meirose, Bernhard; Namasivayam, Harisankar; Reeves, Kendall; ATLAS Collaboration (2016-01-07)
      A search for a high-mass Higgs boson H is performed in the H → WW → ℓν and H → WW → ℓνqq decay channels using pp collision data corresponding to an integrated luminosity of 20.3 fb⁻¹ collected at √s̅ = 8 TeV by the ATLAS ...
    • Search for a Light Higgs Boson Decaying to Two Gluons or ss̅ in the Radiative Decays of ϒ(1s) 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2013-08-06)
      We search for the decay ϒ(1s) → γA⁰, A⁰ → gg or ss̅, where A⁰ is the pseudoscalar light Higgs boson predicted by the next-to-minimal supersymmetric Standard Model. We use a sample of (17.6 ± 0.3) x10⁶ ϒ(1s) mesons produced ...
    • Search for a Light Higgs Resonance in Radiative Decays of the ϒ(1S) with a Charm Tag 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Izen, Joseph M.; Lou, Xinchou (American Physical Society, 2015-04-10)
      A search is presented for the decay ϒ(1S)→γA⁰, A⁰→cc̅, where A⁰ is a candidate for the CP-odd Higgs boson of the next-to-minimal supersymmetric standard model. The search is based on data collected with the BABAR detector ...
    • Search for a Low-Mass Scalar Higgs Boson Decaying to a Tau Pair in Single-Photon Decays of ϒ(1s) 

      Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Izen, Joseph M.; Lou, Xinchou; BaBar Collaboration (American Physical Society, 2013-10-10)
      We search for a low-mass scalar CP-odd Higgs boson, A⁰, produced in the radiative decay of the upsilon resonance and decaying into a τ⁺τ⁻ pair: ϒ(1S)→γA⁰. The production of ϒ(1S) mesons is tagged by ϒ(2S) π⁺π⁻ ϒ(1S) ...