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Measurement of the top quark mass in the tt¯ → lepton+jets channel from √s=8 TeV ATLAS data and combination with previous results

  • ATLAS Collaboration
  • National University of Science and Technology POLITEHNICA Bucharest
  • National Center for Energy, Nuclear Science and Technology
  • Dep Física and CEFITEC of Faculdade de Ciências e Tecnologia
  • NOVA University Lisbon
  • CERN
  • Mohamed I University
  • Aix-Marseille Université
  • University of Oklahoma
  • Azerbaijan National Academy of Sciences
  • IN2P3/CNRS
  • Royal Holloway University of London
  • University of Toronto
  • University of Copenhagen
  • University of Sussex
  • Tel Aviv University
  • Technion-Israel Institute of Technology
  • Argonne National Laboratory
  • National Institute for Nuclear Physics
  • Abdus Salam International Centre for Theoretical Physics
  • The University of Tokyo
  • Johannes Gutenberg University Mainz
  • AGH University of Krakow
  • Northern Illinois University
  • Ludwig Maximilian University of Munich
  • Bogazici University
  • Rutherford Appleton Laboratory
  • University of California at Santa Cruz
  • Alexandru Ioan Cuza University of Iaşi
  • Laboratório de Instrumentação e Física Experimental de Partículas
  • University of Granada
  • Joint Institute for Nuclear Research
  • University of Rome Tor Vergata
  • Kyoto University
  • Lund University
  • University of Geneva
  • P.N. Lebedev Physical Institute of the Russian Academy of Sciences
  • University of Bologna
  • University of Victoria BC
  • Universidad Nacional de La Plata
  • Radboud University Nijmegen
  • Horia Hulubei National Institute of Physics and Nuclear Engineering
  • National Technical University of Athens
  • Czech Technical University in Prague
  • The University of Chicago

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

The top quark mass is measured using a template method in the tt¯ → lepton + jets channel (lepton is e or μ) using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton–proton centre-of-mass energy of s=8 TeV and correspond to an integrated luminosity of 20.2 fb- 1. The tt¯ → lepton + jets channel is characterized by the presence of a charged lepton, a neutrino and four jets, two of which originate from bottom quarks (b). Exploiting a three-dimensional template technique, the top quark mass is determined together with a global jet energy scale factor and a relative b-to-light-jet energy scale factor. The mass of the top quark is measured to be mtop=172.08±0.39(stat)±0.82(syst) GeV. A combination with previous ATLAS mtop measurements gives mtop=172.69±0.25(stat)±0.41(syst) GeV.

Original languageEnglish
Article number290
JournalEuropean Physical Journal C
Volume79
Issue number4
DOIs
StatePublished - Apr 1 2019

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