Eur. Phys. J. C (2024) 84: 157
https://doi.org/10.1140/epjc/s10052-023-12318-9

Regular Article - Experimental Physics

Search for top-philic heavy resonances in pp collisions at   with the ATLAS detector

¹ Department of Physics, University of Adelaide, Adelaide, Australia
² Department of Physics, University of Alberta, Edmonton, AB, Canada
³ Department of Physics, Ankara University, Ankara, Türkiye
⁴ Division of Physics, TOBB University of Economics and Technology, Ankara, Türkiye
⁵ LAPP, Université Savoie Mont Blanc, CNRS/IN2P3, Annecy, France
⁶ APC, Université Paris Cité, CNRS/IN2P3, Paris, France
⁷ High Energy Physics Division, Argonne National Laboratory, Argonne, IL, USA
⁸ Department of Physics, University of Arizona, Tucson, AZ, USA
⁹ Department of Physics, University of Texas at Arlington, Arlington, TX, USA
¹⁰ Physics Department, National and Kapodistrian University of Athens, Athens, Greece
¹¹ Physics Department, National Technical University of Athens, Zografou, Greece
¹² Department of Physics, University of Texas at Austin, Austin, TX, USA
¹³ Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
¹⁴ Institut de Física d’Altes Energies (IFAE), Barcelona Institute of Science and Technology, Barcelona, Spain
¹⁵ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
¹⁶ Physics Department, Tsinghua University, Beijing, China
¹⁷ Department of Physics, Nanjing University, Nanjing, China
¹⁸ School of Science, Shenzhen Campus of Sun Yat-sen University, Shenzhen, China
¹⁹ University of Chinese Academy of Science (UCAS), Beijing, China
²⁰ Institute of Physics, University of Belgrade, Belgrade, Serbia
²¹ Department for Physics and Technology, University of Bergen, Bergen, Norway
²² Physics Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
²³ University of California, Berkeley, CA, USA
²⁴ Institut für Physik, Humboldt Universität zu Berlin, Berlin, Germany
²⁵ Albert Einstein Center for Fundamental Physics and Laboratory for High Energy Physics, University of Bern, Bern, Switzerland
²⁶ School of Physics and Astronomy, University of Birmingham, Birmingham, UK
²⁷ Department of Physics, Bogazici University, Istanbul, Türkiye
²⁸ Department of Physics Engineering, Gaziantep University, Gaziantep, Türkiye
²⁹ Department of Physics, Istanbul University, Istanbul, Turkey
³⁰ Istinye University, Sariyer, Istanbul, Turkey
³¹ Facultad de Ciencias y Centro de Investigaciónes, Universidad Antonio Nariño, Bogotá, Colombia
³² Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia
³³ Pontificia Universidad Javeriana, Bogotá, Colombia
³⁴ Dipartimento di Fisica e Astronomia A. Righi, Università di Bologna, Bologna, Italy
³⁵ INFN Sezione di Bologna, Bologna, Italy
³⁶ Physikalisches Institut, Universität Bonn, Bonn, Germany
³⁷ Department of Physics, Boston University, Boston, MA, USA
³⁸ Department of Physics, Brandeis University, Waltham, MA, USA
³⁹ Transilvania University of Brasov, Brasov, Romania
⁴⁰ Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania
⁴¹ Department of Physics, Alexandru Ioan Cuza University of Iasi, Iasi, Romania
⁴² Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
⁴³ University Politehnica Bucharest, Bucharest, Romania
⁴⁴ West University in Timisoara, Timisoara, Romania
⁴⁵ Faculty of Physics, University of Bucharest, Bucharest, Romania
⁴⁶ Faculty of Mathematics, Physics and Informatics, Comenius University, Bratislava, Slovak Republic
⁴⁷ Department of Subnuclear Physics, Institute of Experimental Physics of the Slovak Academy of Sciences, Kosice, Slovak Republic
⁴⁸ Physics Department, Brookhaven National Laboratory, Upton, NY, USA
⁴⁹ Departamento de Física, y CONICET, Facultad de Ciencias Exactas y Naturales, Instituto de Física de Buenos Aires (IFIBA), Universidad de Buenos Aires, Buenos Aires, Argentina
⁵⁰ California State University, Long Beach, CA, USA
⁵¹ Cavendish Laboratory, University of Cambridge, Cambridge, UK
⁵² Department of Physics, University of Cape Town, Cape Town, South Africa
⁵³ iThemba Labs, Western Cape, South Africa
⁵⁴ Department of Mechanical Engineering Science, University of Johannesburg, Johannesburg, South Africa
⁵⁵ National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
⁵⁶ Department of Physics, University of South Africa, Pretoria, South Africa
⁵⁷ University of Zululand, KwaDlangezwa, Richards Bay, South Africa
⁵⁸ School of Physics, University of the Witwatersrand, Johannesburg, South Africa
⁵⁹ Department of Physics, Carleton University, Ottawa, ON, Canada
⁶⁰ Faculté des Sciences Ain Chock, Réseau Universitaire de Physique des Hautes Energies-Université Hassan II, Casablanca, Morocco
⁶¹ Faculté des Sciences, Université Ibn-Tofail, Kenitra, Morocco
⁶² Faculté des Sciences Semlalia, Université Cadi Ayyad, LPHEA-Marrakech, Marrakech, Morocco
⁶³ LPMR, Faculté des Sciences, Université Mohamed Premier, Oujda, Morocco
⁶⁴ Faculté des sciences, Université Mohammed V, Rabat, Morocco
⁶⁵ Institute of Applied Physics, Mohammed VI Polytechnic University, Ben Guerir, Morocco
⁶⁶ CERN, Geneva, Switzerland
⁶⁷ Affiliated with an Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland
⁶⁸ Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN, Geneva, Switzerland
⁶⁹ Enrico Fermi Institute, University of Chicago, Chicago, IL, USA
⁷⁰ LPC, Université Clermont Auvergne, CNRS/IN2P3, Clermont-Ferrand, France
⁷¹ Nevis Laboratory, Columbia University, Irvington, NY, USA
⁷² Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
⁷³ Dipartimento di Fisica, Università della Calabria, Rende, Italy
⁷⁴ INFN Gruppo Collegato di Cosenza, Laboratori Nazionali di Frascati, Frascati, Italy
⁷⁵ Physics Department, Southern Methodist University, Dallas, TX, USA
⁷⁶ Physics Department, University of Texas at Dallas, Richardson, TX, USA
⁷⁷ National Centre for Scientific Research “Demokritos”, Agia Paraskevi, Greece
⁷⁸ Department of Physics, Stockholm University, Stockholm, Sweden
⁷⁹ Oskar Klein Centre, Stockholm, Sweden
⁸⁰ Deutsches Elektronen-Synchrotron DESY, Hamburg and Zeuthen, Germany
⁸¹ Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
⁸² Institut für Kern- und Teilchenphysik, Technische Universität Dresden, Dresden, Germany
⁸³ Department of Physics, Duke University, Durham, NC, USA
⁸⁴ SUPA-School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK
⁸⁵ INFN e Laboratori Nazionali di Frascati, Frascati, Italy
⁸⁶ Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
⁸⁷ II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany
⁸⁸ Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
⁸⁹ Dipartimento di Fisica, Università di Genova, Genoa, Italy
⁹⁰ INFN Sezione di Genova, Genoa, Italy
⁹¹ II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany
⁹² SUPA-School of Physics and Astronomy, University of Glasgow, Glasgow, UK
⁹³ LPSC, Université Grenoble Alpes, CNRS/IN2P3, Grenoble INP, Grenoble, France
⁹⁴ Laboratory for Particle Physics and Cosmology, Harvard University, Cambridge, MA, USA
⁹⁵ Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei, China
⁹⁶ Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Qingdao, China
⁹⁷ Key Laboratory for Particle Astrophysics and Cosmology (MOE), School of Physics and Astronomy, SKLPPC, Shanghai Jiao Tong University, Shanghai, China
⁹⁸ Tsung-Dao Lee Institute, Shanghai, China
⁹⁹ Kirchhoff-Institut für Physik, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
¹⁰⁰ Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
¹⁰¹ Department of Physics, Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China
¹⁰² Department of Physics, University of Hong Kong, Hong Kong, China
¹⁰³ Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
¹⁰⁴ Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
¹⁰⁵ IJCLab, Université Paris-Saclay, CNRS/IN2P3, 91405, Orsay, France
¹⁰⁶ Centro Nacional de Microelectrónica (IMB-CNM-CSIC), Barcelona, Spain
¹⁰⁷ Department of Physics, Indiana University, Bloomington, IN, USA
¹⁰⁸ INFN Gruppo Collegato di Udine, Sezione di Trieste, Udine, Italy
¹⁰⁹ ICTP, Trieste, Italy
¹¹⁰ Dipartimento Politecnico di Ingegneria e Architettura, Università di Udine, Udine, Italy
¹¹¹ INFN Sezione di Lecce, Lecce, Italy
¹¹² Dipartimento di Matematica e Fisica, Università del Salento, Lecce, Italy
¹¹³ INFN Sezione di Milano, Milan, Italy
¹¹⁴ Dipartimento di Fisica, Università di Milano, Milan, Italy
¹¹⁵ INFN Sezione di Napoli, Naples, Italy
¹¹⁶ Dipartimento di Fisica, Università di Napoli, Naples, Italy
¹¹⁷ INFN Sezione di Pavia, Pavia, Italy
¹¹⁸ Dipartimento di Fisica, Università di Pavia, Pavia, Italy
¹¹⁹ INFN Sezione di Pisa, Pisa, Italy
¹²⁰ Dipartimento di Fisica E. Fermi, Università di Pisa, Pisa, Italy
¹²¹ INFN Sezione di Roma, Rome, Italy
¹²² Dipartimento di Fisica, Sapienza Università di Roma, Rome, Italy
¹²³ INFN Sezione di Roma Tor Vergata, Rome, Italy
¹²⁴ Dipartimento di Fisica, Università di Roma Tor Vergata, Rome, Italy
¹²⁵ INFN Sezione di Roma Tre, Rome, Italy
¹²⁶ Dipartimento di Matematica e Fisica, Università Roma Tre, Rome, Italy
¹²⁷ INFN-TIFPA, Povo, Italy
¹²⁸ Università degli Studi di Trento, Trento, Italy
¹²⁹ Department of Astro and Particle Physics, Universität Innsbruck, Innsbruck, Austria
¹³⁰ University of Iowa, Iowa City, IA, USA
¹³¹ Department of Physics and Astronomy, Iowa State University, Ames, IA, USA
¹³² Departamento de Engenharia Elétrica, Universidade Federal de Juiz de Fora (UFJF), Juiz de Fora, Brazil
¹³³ Universidade Federal do Rio De Janeiro COPPE/EE/IF, Rio de Janeiro, Brazil
¹³⁴ Instituto de Física, Universidade de São Paulo, São Paulo, Brazil
¹³⁵ Rio de Janeiro State University, Rio de Janeiro, Brazil
¹³⁶ KEK, High Energy Accelerator Research Organization, Tsukuba, Japan
¹³⁷ Graduate School of Science, Kobe University, Kobe, Japan
¹³⁸ Faculty of Physics and Applied Computer Science, AGH University of Krakow, Kraków, Poland
¹³⁹ Marian Smoluchowski Institute of Physics, Jagiellonian University, Kraków, Poland
¹⁴⁰ Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
¹⁴¹ Faculty of Science, Kyoto University, Kyoto, Japan
¹⁴² Kyoto University of Education, Kyoto, Japan
¹⁴³ Research Center for Advanced Particle Physics and Department of Physics, Kyushu University, Fukuoka, Japan
¹⁴⁴ Instituto de Física La Plata, Universidad Nacional de La Plata and CONICET, La Plata, Argentina
¹⁴⁵ Physics Department, Lancaster University, Lancaster, UK
¹⁴⁶ Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK
¹⁴⁷ Department of Experimental Particle Physics, Jožef Stefan Institute and Department of Physics, University of Ljubljana, Ljubljana, Slovenia
¹⁴⁸ School of Physics and Astronomy, Queen Mary University of London, London, UK
¹⁴⁹ Department of Physics, Royal Holloway University of London, Egham, UK
¹⁵⁰ Department of Physics and Astronomy, University College London, London, UK
¹⁵¹ Louisiana Tech University, Ruston, LA, USA
¹⁵² Fysiska institutionen, Lunds universitet, Lund, Sweden
¹⁵³ Departamento de Física Teorica C-15 and CIAFF, Universidad Autónoma de Madrid, Madrid, Spain
¹⁵⁴ Institut für Physik, Universität Mainz, Mainz, Germany
¹⁵⁵ School of Physics and Astronomy, University of Manchester, Manchester, UK
¹⁵⁶ CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France
¹⁵⁷ Department of Physics, University of Massachusetts, Amherst, MA, USA
¹⁵⁸ Department of Physics, McGill University, Montreal, QC, Canada
¹⁵⁹ School of Physics, University of Melbourne, Melbourne, VIC, Australia
¹⁶⁰ Department of Physics, University of Michigan, Ann Arbor, MI, USA
¹⁶¹ Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
¹⁶² Group of Particle Physics, University of Montreal, Montreal, QC, Canada
¹⁶³ Fakultät für Physik, Ludwig-Maximilians-Universität München, Munich, Germany
¹⁶⁴ Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Munich, Germany
¹⁶⁵ Graduate School of Science and Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Japan
¹⁶⁶ Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
¹⁶⁷ Institute for Mathematics, Astrophysics and Particle Physics, Radboud University/Nikhef, Nijmegen, The Netherlands
¹⁶⁸ Nikhef National Institute for Subatomic Physics and University of Amsterdam, Amsterdam, The Netherlands
¹⁶⁹ Department of Physics, Northern Illinois University, DeKalb, IL, USA
¹⁷⁰ New York University Abu Dhabi, Abu Dhabi, United Arab Emirates
¹⁷¹ University of Sharjah, Sharjah, United Arab Emirates
¹⁷² Department of Physics, New York University, New York, NY, USA
¹⁷³ Ochanomizu University, Otsuka, Bunkyo-ku, Tokyo, Japan
¹⁷⁴ Ohio State University, Columbus, OH, USA
¹⁷⁵ Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, OK, USA
¹⁷⁶ Department of Physics, Oklahoma State University, Stillwater, OK, USA
¹⁷⁷ Joint Laboratory of Optics, Palacký University, Olomouc, Czech Republic
¹⁷⁸ Institute for Fundamental Science, University of Oregon, Eugene, OR, USA
¹⁷⁹ Graduate School of Science, Osaka University, Osaka, Japan
¹⁸⁰ Department of Physics, University of Oslo, Oslo, Norway
¹⁸¹ Department of Physics, Oxford University, Oxford, UK
¹⁸² LPNHE, Sorbonne Université, Université Paris Cité, CNRS/IN2P3, Paris, France
¹⁸³ Department of Physics, University of Pennsylvania, Philadelphia, PA, USA
¹⁸⁴ Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA, USA
¹⁸⁵ Laboratório de Instrumentação e Física Experimental de Partículas-LIP, Lisbon, Portugal
¹⁸⁶ Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Lisbon, Portugal
¹⁸⁷ Departamento de Física, Universidade de Coimbra, Coimbra, Portugal
¹⁸⁸ Centro de Física Nuclear da Universidade de Lisboa, Lisbon, Portugal
¹⁸⁹ Departamento de Física, Universidade do Minho, Braga, Portugal
¹⁹⁰ Departamento de Física Teórica y del Cosmos, Universidad de Granada, Granada, Spain
¹⁹¹ Departamento de Física, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
¹⁹² Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic
¹⁹³ Czech Technical University in Prague, Prague, Czech Republic
¹⁹⁴ Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
¹⁹⁵ Particle Physics Department, Rutherford Appleton Laboratory, Didcot, UK
¹⁹⁶ IRFU, CEA, Université Paris-Saclay, Gif-sur-Yvette, France
¹⁹⁷ Santa Cruz Institute for Particle Physics, University of California Santa Cruz, Santa Cruz, CA, USA
¹⁹⁸ Departamento de Física, Pontificia Universidad Católica de Chile, Santiago, Chile
¹⁹⁹ Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR), Santiago, Chile
²⁰⁰ Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, y Departamento de Física, Universidad de La Serena, La Serena, Chile
²⁰¹ Department of Physics, Universidad Andres Bello, Santiago, Chile
²⁰² Instituto de Alta Investigación, Universidad de Tarapacá, Arica, Chile
²⁰³ Departamento de Física, Universidad Técnica Federico Santa María, Valparaiso, Chile
²⁰⁴ Department of Physics, University of Washington, Seattle, WA, USA
²⁰⁵ Department of Physics and Astronomy, University of Sheffield, Sheffield, UK
²⁰⁶ Department of Physics, Shinshu University, Nagano, Japan
²⁰⁷ Department Physik, Universität Siegen, Siegen, Germany
²⁰⁸ Department of Physics, Simon Fraser University, Burnaby, BC, Canada
²⁰⁹ SLAC National Accelerator Laboratory, Stanford, CA, USA
²¹⁰ Department of Physics, Royal Institute of Technology, Stockholm, Sweden
²¹¹ Departments of Physics and Astronomy, Stony Brook University, Stony Brook, NY, USA
²¹² Department of Physics and Astronomy, University of Sussex, Brighton, UK
²¹³ School of Physics, University of Sydney, Sydney, Australia
²¹⁴ Institute of Physics, Academia Sinica, Taipei, Taiwan
²¹⁵ E. Andronikashvili Institute of Physics, Iv. Javakhishvili Tbilisi State University, Tbilisi, Georgia
²¹⁶ High Energy Physics Institute, Tbilisi State University, Tbilisi, Georgia
²¹⁷ University of Georgia, Tbilisi, Georgia
²¹⁸ Department of Physics, Technion, Israel Institute of Technology, Haifa, Israel
²¹⁹ Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv, Israel
²²⁰ Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
²²¹ International Center for Elementary Particle Physics and Department of Physics, University of Tokyo, Tokyo, Japan
²²² Department of Physics, Tokyo Institute of Technology, Tokyo, Japan
²²³ Department of Physics, University of Toronto, Toronto, ON, Canada
²²⁴ TRIUMF, Vancouver, BC, Canada
²²⁵ Department of Physics and Astronomy, York University, Toronto, ON, Canada
²²⁶ Division of Physics and Tomonaga Center for the History of the Universe, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
²²⁷ Department of Physics and Astronomy, Tufts University, Medford, MA, USA
²²⁸ United Arab Emirates University, Al Ain, United Arab Emirates
²²⁹ Department of Physics and Astronomy, University of California Irvine, Irvine, CA, USA
²³⁰ Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden
²³¹ Department of Physics, University of Illinois, Urbana, IL, USA
²³² Instituto de Física Corpuscular (IFIC), Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain
²³³ Department of Physics, University of British Columbia, Vancouver, BC, Canada
²³⁴ Department of Physics and Astronomy, University of Victoria, Victoria, BC, Canada
²³⁵ Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany
²³⁶ Department of Physics, University of Warwick, Coventry, UK
²³⁷ Waseda University, Tokyo, Japan
²³⁸ Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel
²³⁹ Department of Physics, University of Wisconsin, Madison, WI, USA
²⁴⁰ Fakultät für Mathematik und Naturwissenschaften, Fachgruppe Physik, Bergische Universität Wuppertal, Wuppertal, Germany
²⁴¹ Department of Physics, Yale University, New Haven, CT, USA
²⁴² Institute Covered by a Cooperation Agreement with CERN, Geneva, Switzerland
²⁴³ An-Najah National University, Nablus, Palestine
²⁴⁴ Borough of Manhattan Community College, City University of New York, New York, NY, USA
²⁴⁵ Bruno Kessler Foundation, Trento, Italy
²⁴⁶ Center for High Energy Physics, Peking University, Beijing, China
²⁴⁷ Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Thessaloniki, Greece
²⁴⁸ Centro Studi e Ricerche Enrico Fermi, Rome, Italy
²⁴⁹ CERN, Geneva, Switzerland
²⁵⁰ Département de Physique Nucléaire et Corpusculaire, Université de Genève, Geneva, Switzerland
²⁵¹ Departament de Fisica de la Universitat Autonoma de Barcelona, Barcelona, Spain
²⁵² Department of Financial and Management Engineering, University of the Aegean, Chios, Greece
²⁵³ Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA
²⁵⁴ Department of Physics, Ben Gurion University of the Negev, Beersheba, Israel
²⁵⁵ Department of Physics, California State University, East Bay, USA
²⁵⁶ Department of Physics, California State University, Sacramento, USA
²⁵⁷ Department of Physics, King’s College London, London, UK
²⁵⁸ Department of Physics, Stanford University, Stanford, CA, USA
²⁵⁹ Department of Physics, University of Fribourg, Fribourg, Switzerland
²⁶⁰ Department of Physics, University of Thessaly, Vólos, Greece
²⁶¹ Department of Physics, Westmont College, Santa Barbara, USA
²⁶² Hellenic Open University, Patras, Greece
²⁶³ Institucio Catalana de Recerca i Estudis Avancats, ICREA, Barcelona, Spain
²⁶⁴ Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany
²⁶⁵ Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences, Sofia, Bulgaria
²⁶⁶ Institute of Applied Physics, Mohammed VI Polytechnic University, Ben Guerir, Morocco
²⁶⁷ Institute of Particle Physics (IPP), Victoria, Canada
²⁶⁸ Institute of Physics and Technology, Ulaanbaatar, Mongolia
²⁶⁹ Institute of Physics, Azerbaijan Academy of Sciences, Baku, Azerbaijan
²⁷⁰ Institute of Theoretical Physics, Ilia State University, Tbilisi, Georgia
²⁷¹ L2IT, Université de Toulouse, CNRS/IN2P3, UPS, Toulouse, France
²⁷² Lawrence Livermore National Laboratory, Livermore, USA
²⁷³ National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
²⁷⁴ Technical University of Munich, Munich, Germany
²⁷⁵ The Collaborative Innovation Center of Quantum Matter (CICQM), Beijing, China
²⁷⁶ TRIUMF, Vancouver, BC, Canada
²⁷⁷ Università di Napoli Parthenope, Napoli, Italy
²⁷⁸ Department of Physics, University of Colorado Boulder, Colorado, USA
²⁷⁹ Washington College, Chestertown, MD, USA
²⁸⁰ Physics Department, Yeditepe University, Istanbul, Türkiye
²⁸¹ CERN, 1211, Geneva 23, Switzerland

^a atlas.publications@cern.ch

Received: 5 April 2023
Accepted: 3 December 2023
Published online: 15 February 2024

Abstract

A search for the associated production of a heavy resonance with a top-quark or a top-antitop-quark pair, and decaying into a pair is presented. The search uses the data recorded by the ATLAS detector in pp collisions at   at the Large Hadron Collider during the years 2015–2018, corresponding to an integrated luminosity of 139 . Events containing exactly one electron or muon are selected. The two hadronically decaying top quarks from the resonance decay are reconstructed using jets clustered with a large radius parameter of . The invariant mass spectrum of the two top quark candidates is used to search for a resonance signal in the range of 1.0  to 3.2 . The presence of a signal is examined using an approach with minimal model dependence followed by a model-dependent interpretation. No significant excess is observed over the background expectation. Upper limits on the production cross section times branching ratio at 95% confidence level are provided for a heavy boson based on a simplified model, for mass between 1.0  and 3.0 . The observed (expected) limits range from 21 (14) fb to 119 (86) fb depending on the choice of model parameters.