https://doi.org/10.1140/epjc/s10052-019-6847-8
Regular Article - Experimental Physics
Performance of top-quark and 
-boson tagging with ATLAS in Run 2 of the LHC
1
Department of Physics, University of Adelaide, Adelaide, Australia
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Physics Department, SUNY Albany, Albany, NY, USA
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Department of Physics, University of Alberta, Edmonton, AB, Canada
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Department of Physics, Ankara University, Ankara, Turkey
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Istanbul Aydin University, Istanbul, Turkey
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Division of Physics, TOBB University of Economics and Technology, Ankara, Turkey
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LAPP, Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
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High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
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Department of Physics, University of Arizona, Tucson, AZ, USA
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Department of Physics, University of Texas at Arlington, Arlington, TX, USA
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Physics Department, National and Kapodistrian University of Athens, Athens, Greece
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Physics Department, National Technical University of Athens, Zografou, Greece
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Department of Physics, University of Texas at Austin, Austin, TX, USA
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Faculty of Engineering and Natural Sciences, Bahcesehir University, Istanbul, Turkey
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Faculty of Engineering and Natural Sciences, Istanbul Bilgi University, Istanbul, Turkey
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Department of Physics, Bogazici University, Istanbul, Turkey
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Department of Physics Engineering, Gaziantep University, Gaziantep, Turkey
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Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
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Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain
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Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
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Physics Department, Tsinghua University, Beijing, China
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Department of Physics, Nanjing University, Nanjing, China
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University of Chinese Academy of Science (UCAS), Beijing, China
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Institute of Physics, University of Belgrade, Belgrade, Serbia
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Department for Physics and Technology, University of Bergen, Bergen, Norway
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Physics Division, Lawrence Berkeley National Laboratory and University of California, Berkeley, CA, USA
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Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany
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Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
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School of Physics and Astronomy, University of Birmingham, Birmingham, UK
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Centro de Investigaciónes, Universidad Antonio Nariño, Bogota, Colombia
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Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy
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INFN Sezione di Bologna, Bologna, Italy
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Physikalisches Institut, Universität Bonn, Bonn, Germany
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Department of Physics, Boston University, Boston, MA, USA
35
Department of Physics, Brandeis University, Waltham, MA, USA
36
Transilvania University of Brasov, Brasov, Romania
37
Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
38
Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
39
Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
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University Politehnica Bucharest, Bucharest, Romania
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West University in Timisoara, Timisoara, Romania
42
Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovakia
43
Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
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Physics Department, Brookhaven National Laboratory, Upton, NY, USA
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Departamento de Física, Universidad de Buenos Aires, Buenos Aires, Argentina
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Cavendish Laboratory, University of Cambridge, Cambridge, UK
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Department of Physics, University of Cape Town, Cape Town, South Africa
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Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
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School of Physics, University of the Witwatersrand, Johannesburg, South Africa
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Department of Physics, Carleton University, Ottawa, ON, Canada
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Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
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Centre National de l’Energie des Sciences Techniques Nucleaires (CNESTEN), Rabat, Morocco
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Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
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Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco
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Faculté des sciences, Université Mohammed V, Rabat, Morocco
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CERN, Geneva, Switzerland
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Enrico Fermi Institute, University of Chicago, Chicago, IL, USA
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LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France
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Nevis Laboratory, Columbia University, Irvington, NY, USA
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Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
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Dipartimento di Fisica, Università della Calabria, Rende, Italy
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INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
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Physics Department, Southern Methodist University, Dallas, TX, USA
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Physics Department, University of Texas at Dallas, Richardson, TX, USA
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Department of Physics, Stockholm University, Stockholm, Sweden
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Oskar Klein Centre, Stockholm, Sweden
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Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
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Lehrstuhl für Experimentelle Physik IV, Technische Universität Dortmund, Dortmund, Germany
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Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
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Department of Physics, Duke University, Durham, NC, USA
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SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
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INFN e Laboratori Nazionali di Frascati, Frascati, Italy
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Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
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II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
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Département de Physique Nucléaire et Corpusculaire, Université de Genève, Genève, Switzerland
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Dipartimento di Fisica, Università di Genova, Genoa, Italy
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INFN Sezione di Genova, Genoa, Italy
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II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
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SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UK
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LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France
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Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
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Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
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Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, China
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School of Physics and Astronomy, Shanghai Jiao Tong University, KLPPAC-MoE, SKLPPC, Shanghai, China
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Tsung-Dao Lee Institute, Shanghai, China
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Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
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Faculty of Applied Information Science, Hiroshima Institute of Technology, Hiroshima, Japan
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Department of Physics, Chinese University of Hong Kong, Shatin, N.T, Hong Kong
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Department of Physics, University of Hong Kong, Hong Kong, China
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Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
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Department of Physics, Indiana University, Bloomington, IN, USA
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INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
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ICTP, Trieste, Italy
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Dipartimento di Chimica, Fisica e Ambiente, Università di Udine, Udine, Italy
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INFN Sezione di Lecce, Lecce, Italy
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Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
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INFN Sezione di Milano, Milan, Italy
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Dipartimento di Fisica, Università di Milano, Milan, Italy
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INFN Sezione di Napoli, Naples, Italy
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Dipartimento di Fisica, Università di Napoli, Naples, Italy
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INFN Sezione di Pavia, Pavia, Italy
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Dipartimento di Fisica, Università di Pavia, Pavia, Italy
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INFN Sezione di Pisa, Pisa, Italy
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Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
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INFN Sezione di Roma, Rome, Italy
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Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
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INFN Sezione di Roma Tor Vergata, Rome, Italy
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Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
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INFN Sezione di Roma Tre, Rome, Italy
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Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
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INFN-TIFPA, Povo, Italy
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Università degli Studi di Trento, Trento, Italy
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Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität, Innsbruck, Austria
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University of Iowa, Iowa City, IA, USA
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Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
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Joint Institute for Nuclear Research, Dubna, Russia
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Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil
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Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
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Universidade Federal de São João del Rei (UFSJ), São João del Rei, Brazil
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Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
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KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
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Graduate School of Science, Kobe University, Kobe, Japan
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Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Krakow, Poland
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Marian Smoluchowski Institute of Physics, Jagiellonian University, Krakow, Poland
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Institute of Nuclear Physics Polish Academy of Sciences, Krakow, Poland
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Faculty of Science, Kyoto University, Kyoto, Japan
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Kyoto University of Education, Kyoto, Japan
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Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, Japan
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Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
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Physics Department, Lancaster University, Lancaster, UK
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Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
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Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia
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School of Physics and Astronomy, Queen Mary University of London, London, UK
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Department of Physics, Royal Holloway University of London, Egham, UK
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Department of Physics and Astronomy, University College London, London, UK
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Louisiana Tech University, Ruston, LA, USA
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Fysiska institutionen, Lunds universitet, Lund, Sweden
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Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), Villeurbanne, France
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Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain
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Institut für Physik, Universität Mainz, Mainz, Germany
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School of Physics and Astronomy, University of Manchester, Manchester, UK
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CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
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Department of Physics, University of Massachusetts, Amherst, MA, USA
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Department of Physics, McGill University, Montreal, QC, Canada
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School of Physics, University of Melbourne,
Melbourne, Victoria, Australia
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Department of Physics, University of Michigan, Ann Arbor, MI, USA
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Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
150
B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk, Belarus
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Research Institute for Nuclear Problems of Byelorussian State University, Minsk, Belarus
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Group of Particle Physics, University of Montreal, Montreal, QC, Canada
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P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow, Russia
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Institute for Theoretical and Experimental Physics (ITEP), Moscow, Russia
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National Research Nuclear University MEPhI, Moscow, Russia
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D.V. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia
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Fakultät für Physik, Ludwig-Maximilians-Universität München, München, Germany
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Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), München, Germany
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Nagasaki Institute of Applied Science, Nagasaki, Japan
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Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
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Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
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Institute for Mathematics, Astrophysics and Particle Physics, Radboud University Nijmegen/Nikhef, Nijmegen, The Netherlands
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Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
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Department of Physics, Northern Illinois University, DeKalb, IL, USA
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Budker Institute of Nuclear Physics, SB RAS, Novosibirsk, Russia
166
Novosibirsk State University, Novosibirsk, Russia
167
Department of Physics, New York University, New York, NY, USA
168
Ohio State University, Columbus, OH, USA
169
Faculty of Science, Okayama University, Okayama, Japan
170
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
171
Department of Physics, Oklahoma State University, Stillwater, OK, USA
172
Palacký University, RCPTM, Joint Laboratory of Optics, Olomouc, Czech Republic
173
Center for High Energy Physics, University of Oregon, Eugene, OR, USA
174
LAL, Université Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France
175
Graduate School of Science, Osaka University, Osaka, Japan
176
Department of Physics, University of Oslo, Oslo, Norway
177
Department of Physics, Oxford University, Oxford, UK
178
LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
179
Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
180
Konstantinov Nuclear Physics Institute of National Research Centre “Kurchatov Institute”, PNPI, St. Petersburg, Russia
181
Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
182
Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisbon, Portugal
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Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
184
Departamento de Física, Universidade de Coimbra, Coimbra, Portugal
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Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
186
Departamento de Física, Universidade do Minho, Braga, Portugal
187
Departamento de Física Teorica y del Cosmos, Universidad de Granada, Granada, Spain
188
Dep Física and CEFITEC of Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Caparica, Portugal
189
Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic
190
Czech Technical University in Prague, Prague, Czech Republic
191
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
192
State Research Center Institute for High Energy Physics, NRC KI, Protvino, Russia
193
Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
194
IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
195
Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
196
Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
197
Departamento de Física, Universidad Técnica Federico Santa María, Valparaíso, Chile
198
Department of Physics, University of Washington, Seattle, WA, USA
199
Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
200
Department of Physics, Shinshu University, Nagano, Japan
201
Department Physik, Universität Siegen, Siegen, Germany
202
Department of Physics, Simon Fraser University, Burnaby, BC, Canada
203
SLAC National Accelerator Laboratory, Stanford, CA, USA
204
Physics Department, Royal Institute of Technology, Stockholm, Sweden
205
Departments of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA
206
Department of Physics and Astronomy, University of Sussex, Brighton, UK
207
School of Physics, University of Sydney, Sydney, Australia
208
Institute of Physics, Academia Sinica, Taipei, Taiwan
209
E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
210
High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
211
Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel
212
Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
213
Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
214
International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
215
Graduate School of Science and Technology, Tokyo Metropolitan University, Tokyo, Japan
216
Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
217
Tomsk State University, Tomsk, Russia
218
Department of Physics, University of Toronto, Toronto, ON, Canada
219
TRIUMF, Vancouver, BC, Canada
220
Department of Physics and Astronomy, York University, Toronto, ON, Canada
221
Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
222
Department of Physics and Astronomy, Tufts University, Medford, MA, USA
223
Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
224
Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
225
Department of Physics, University of Illinois, Urbana, IL, USA
226
Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain
227
Department of Physics, University of British Columbia, Vancouver, BC, Canada
228
Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
229
Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
230
Department of Physics, University of Warwick, Coventry, UK
231
Waseda University, Tokyo, Japan
232
Department of Particle Physics, Weizmann Institute of Science, Rehovot, Israel
233
Department of Physics, University of Wisconsin, Madison, WI, USA
234
Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
235
Department of Physics, Yale University, New Haven, CT, USA
236
Yerevan Physics Institute, Yerevan, Armenia
237
CERN, 1211, Geneva 23, Switzerland
* e-mail: atlas.publications@cern.ch
Received:
24
August
2018
Accepted:
3
April
2019
Published online:
30
April
2019
The performance of identification algorithms (“taggers”) for hadronically decaying top quarks and W bosons in pp collisions at 
= 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 physics analyses. The studies are extended to assess the utility of combinations of substructure observables as a multivariate tagger using boosted decision trees or deep neural networks in comparison with taggers based on two-variable combinations. In addition, for highly boosted top-quark tagging, a deep neural network based on jet constituent inputs as well as a re-optimisation of the shower deconstruction technique is presented. The performance of these taggers is studied in data collected during 2015 and 2016 corresponding to 36.1 fb
for the 
and 
and 36.7 fb for the dijet event topologies.
© CERN for the benefit of the ATLAS collaboration, 2019
