2010/12/09 by The ATLAS Collaboration, G. Aad, B. Abbott +98 · 5 citations
Physics and Astronomy · #Atlas (anatomy) #Bar (unit) #Electron #Energy (signal processing) #Hadron #High-Energy Particle Collisions Research #Large Hadron Collider #Lepton #Muon #Nuclear physics #Pair production #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quantum chromodynamics #Quark #Standard Model (mathematical formulation) #Top quark #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-011-1577-6
published as Eur.Phys.J.C71:1577,2011 · 30 pages plus author list (50 pages total), 9 figures, 11 tables, CERN-PH number and final journal added
arxiv created 2010/12/09 · openalex publication_date 2011/03/01 · arxiv updated 2015/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
A measurement of the production cross-section for top quark pairs(\ttbar) in pp collisions at √(s)=7 \TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon μ) with large missing transverse energy and at least four jets, and dilepton (ee, μμ or eμ) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb-1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non-\ttbar Standard Model processes are estimated using data-driven methods and determined to be 12.2 ± 3.9 events and 2.5 ± 0.6 events, respectively. The kinematic properties of the selected events are consistent with SM \ttbar production. The inclusive top quark pair production cross-section is measured to be \sigmattbar=145 ± 31 +42-27 pb where the first uncertainty is statistical and the second systematic. The measurement agrees with perturbative QCD calculations.