2015/11/30 by G. Aad, ATLAS Collaboration, B. Abbott +98 · 3 citations
Physics and Astronomy · #Compact Muon Solenoid #Galaxy #Hadron #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Luminosity #Muon #Nuclear physics #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Production (economics) #Quark #Standard Model (mathematical formulation) #Tevatron #Top quark #hep-ex
paper · pdf · doi:10.1016/j.physletb.2016.03.017
published as Phys. Lett. B (2016) 228-246 · 16 pages plus author list + cover page (34 pages total), 4 figures, 2 tables, submitted to PLB. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-01/
openalex publication_date 2016/03/08 · arxiv created 2016/03/23 · arxiv updated 2016/03/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
This Letter presents evidence for single top-quark production in the s -channel using proton–proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The analysis is performed on events containing one isolated electron or muon, large missing transverse momentum and exactly two b -tagged jets in the final state. The analysed data set corresponds to an integrated luminosity of 20.3 fb − 1 . The signal is extracted using a maximum-likelihood fit of a discriminant which is based on the matrix element method and optimized in order to separate single-top-quark s -channel events from the main background contributions, which are top-quark pair production and W boson production in association with heavy-flavour jets. The measurement leads to an observed signal significance of 3.2 standard deviations and a measured cross-section of σ s = 4.8 ± 0.8 (stat.) − 1.3 + 1.6 (syst.) pb , which is consistent with the Standard Model expectation. The expected significance for the analysis is 3.9 standard deviations.