Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s} = 13$$ TeV proton–proton collisions with the ATLAS detector
- Aix-Marseille Univ., Marseille (France)
- University of Bergen
- University of Oklahoma
- New York University Abu Dhabi
- Georg-August-Universität Göttingen
- Technische Universität Dortmund
- Brookhaven National Laboratory
- Southern Methodist University
- Université Mohammed V
- Tel Aviv University
- New York University
- Sezione di Trieste; ICTP; King’s College London
- Ruprecht-Karls-Universität Heidelberg
- Université Savoie Mont Blanc
- Faculty of Physics and Applied Computer Science
- SLAC National Accelerator Laboratory
- University of Manchester
- Northern Illinois University
- Istanbul University
- Rutherford Appleton Laboratory
- University of California Santa Cruz
- University of Chicago
- Barcelona Institute of Science and Technology
- Universität Mainz
- Alexandru Ioan Cuza University of Iasi
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN; Azerbaijan Academy of Sciences
- Royal Holloway University of London
- School of Physics, Zhengzhou University
- INFN Sezione di Roma Tor Vergata; Università di Roma Tor Vergata
- Centro Mixto Universidad de Valencia - CSIC
- Université Hassan II de Casablanca
- Lunds universitet
- Stony Brook University
- Waseda University
- Universität Bonn
- Bogazici University
- INFN Sezione di Bologna
- University of Victoria
- INFN e Laboratori Nazionali di Frascati
- Grenoble INP
- University of Edinburgh
- Oklahoma State University
- CERN
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN
- Horia Hulubei National Institute of Physics and Nuclear Engineering
- National Technical University of Athens
- Université de Genève
- University of Warwick
- Czech Technical University in Prague
- Lancaster University; Imam Mohammad Ibn Saud Islamic University
- California State University
- University of Liverpool
- University of Johannesburg
- INFN Sezione di Milano
- Université Paris-Saclay
- University of Sussex
- University of Birmingham
- INFN Sezione di Napoli; Università di Napoli
- Universidad Nacional de La Plata and CONICET
- University of Washington
- Lancaster University
- Universidade Federal do Rio De Janeiro COPPE/EE/IF
- McGill University
- Ludwig-Maximilians-Universität München
- Sorbonne Université, Université Paris Cité
- University of Michigan
- Albert-Ludwigs-Universität Freiburg
- University of Toronto
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP
- Aristotle University of Thessaloniki
- High Energy Accelerator Research Organization
- University of Sheffield
- University of Texas at Austin
- University of Glasgow
- INFN Sezione di Milano; Università di Milano
- National and Kapodistrian University of Athens
- Columbia University
- INFN Sezione di Pisa
- INFN Sezione di Roma
- University of Tokyo
- Deutsches Elektronen-Synchrotron DESY
- Universidad de Buenos Aires
- Brandeis University
- Institute of Nuclear Physics Polish Academy of Sciences
- Duke University
- University of Montreal
- INFN Sezione di Roma; Sapienza Università di Roma
- Nagoya University
- Ochanomizu University
- Yerevan Physics Institute
- Comenius University
- University of California Irvine
- University of Cape Town
- Mohammed VI Polytechnic University
- University of Pennsylvania
- Université Clermont Auvergne
- University of Montreal; TRIUMF
- Institute of Experimental Physics of the Slovak Academy of Sciences
- Aristotle University of Thessaloniki; University of Thessaly
- Carleton University
- Technische Universität Dresden
- Humboldt Universität zu Berlin
- University of Oregon
- Queen Mary University of London
- Yale University
- University of Belgrade
- University of Texas at Arlington
- Affiliated with an Institute Formerly Covered by a Cooperation Agreement with CERN
- Università di Bologna; INFN Sezione di Bologna
- University of Cambridge
- United Arab Emirates University
- University of Pittsburgh
- University of Melbourne
- University of California
- Aix-Marseille Université
- Nikhef National Institute for Subatomic Physics and University of Amsterdam
- Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)
- Charles University
- University of Science and Technology of China
- Oxford University
- University College London
- Universidad Autónoma de Madrid
- Chinese Academy of Sciences
- Université Paris-Saclay; An-Najah National University
- TRIUMF
- University of British Columbia
- Department of Astro and Particle Physics
- Tufts University
- University of Bern; University of Fribourg
- Istinye University
- Rio de Janeiro State University
- Indiana University
- Harvard University
- University of Uppsala
- Lawrence Berkeley National Laboratory
- CNRS/IN2P3
- INFN Sezione di Roma Tre
- Bergische Universität Wuppertal
- Gaziantep University
- Weizmann Institute of Science
- Universität Siegen
- Julius-Maximilians-Universität Würzburg
- Università di Genova; INFN Sezione di Genova
- Ohio State University
- University of Massachusetts
- INFN-TIFPA; Università degli Studi di Trento
- Michigan State University
- York University
- TRIUMF; University of Victoria
- Stockholm University; Oskar Klein Centre
- Université de Toulouse
- University of Illinois
- Simon Fraser University
- Boston University
- Justus-Liebig-Universität Giessen
- Università di Bologna; INFN Sezione di Bologna; University of Chinese Academy of Science (UCAS)
- Nanjing University
- Ankara University
- University of Copenhagen
- Università della Calabria; Laboratori Nazionali di Frascati, INFN Gruppo Collegato di Cosenza
- INFN Sezione di Roma Tor Vergata
- INFN Sezione di Napoli
- University of Pittsburgh; Westmont College
- Radboud University/Nikhef
- Universidad Técnica Federico Santa María
- INFN Sezione di Pavia; Università di Pavia
- Barcelona Institute of Science and Technology; Departament de Fisica de la Universitat Autonoma de Barcelona
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade do Minho
- University of Oslo
- Universidad Nacional de Colombia
- Joint Laboratory of Optics
- Universidade Federal de Juiz de Fora (UFJF)
- INFN Sezione di Pisa; Università di Pisa; University of Sienna
- Tbilisi State University
- Argonne National Laboratory
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN; Affiliated with an Institute Formerly Covered by a Cooperation Agreement with CERN
- Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC
- Kyoto University
- Tsinghua University; The Collaborative Innovation Center of Quantum Matter (CICQM)
- University of Wisconsin
- Chinese University of Hong Kong
- University of Arizona
- National Tsing Hua University
- INFN Sezione di Lecce
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN; Sofia University ‘St. Kliment Ohridski’
- Chinese Academy of Sciences; University of Chinese Academy of Science (UCAS)
- Institute of Physics of the Czech Academy of Sciences
- University of Ljubljana
- Sezione di Trieste; Università di Udine
- INFN Sezione di Genova
- INFN Sezione di Lecce; Università del Salento
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade de Lisboa
- INFN Sezione di Napoli; Università di Napoli Parthenope
- McGill University; Institute of Particle Physics (IPP)
- Academia Sinica
- University of Bern
- INFN Sezione di Pisa; Università di Pisa
- Bogazici University; Bolu Abant Izzet Baysal University
- INFN Sezione di Roma Tre; Università Roma Tre
- Pontificia Universidad Católica de Chile; Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR)
- Royal Institute of Technology
- Lunds universitet; University of Manchester
- University of Bucharest
- Federal University of Bahia
- Université Ibn-Tofail
- University of Hong Kong
- Sezione di Trieste; ICTP
- Louisiana Tech University
- University of Edinburgh; Rutherford Appleton Laboratory
- Affiliated with an Institute Formerly Covered by a Cooperation Agreement with CERN; Affiliated with an Institute Formerly Covered by a Cooperation Agreement with CERN
- Shandong University
- Centro Nacional de Microelectrónica (IMB-CNM-CSIC)
- Radboud University/Nikhef; Nikhef National Institute for Subatomic Physics and University of Amsterdam
- INFN Sezione di Pavia
- University of Adelaide
- Horia Hulubei National Institute of Physics and Nuclear Engineering; University of Bucharest
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade de Coimbra; City University of New York
- University of the Philippines Diliman (Philippines); National Institute of Physics, University of the Philippines Diliman (Philippines)
- National and Kapodistrian University of Athens; University of the Aegean
- University of Sharjah
- University of New Mexico
- National Centre for Scientific Research “Demokritos”
- Jagiellonian University
- University of Alberta; TRIUMF
- Laboratori Nazionali di Frascati, INFN Gruppo Collegato di Cosenza
- University of Georgia
- West University in Timisoara
- Barcelona Institute of Science and Technology; ICREA
- School of Science, Shenzhen Campus of Sun Yat-sen University; Henan University
- Royal Holloway University of London; Rutherford Appleton Laboratory
- Shinshu University
- University of Osaka
- University of Tsukuba
- National University of Science and Technology Politechnica
- School of Science, Shenzhen Campus of Sun Yat-sen University
- Azerbaijan Academy of Sciences; CMD-AC UNEC Research Center, Azerbaijan State University of Economics (UNEC)
- Universidad de La Serena
- Bogazici University; Yeditepe University
- Iv. Javakhishvili Tbilisi State University; Ilia State University
- Albert-Ludwigs-Universität Freiburg; CERN
- Institute of Science
- CERN; Georg-August-Universität Göttingen
- Universidad de Tarapacá
- Israel Institute of Technology
- University of the Witwatersrand
- University of Adelaide; Tbilisi State University
- Aristotle University of Thessaloniki; Center for Interdisciplinary Research and Innovation (CIRI-AUTH)
- Iowa State University
- Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR); Department of Physics
- Kobe University
- Aristotle University of Thessaloniki; Hellenic Open University
- Universidade de São Paulo
- Tsinghua University
- Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC; Shanghai Jiao Tong University
- Hong Kong University of Science and Technology
- Shanghai Jiao Tong University
- University of Washington; Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MOE), SKLPPC; Shanghai Jiao Tong University
- School of Science, Shenzhen Campus of Sun Yat-sen University; University of Chinese Academy of Science (UCAS)
- Université Paris-Saclay; University of Science and Technology of China
- University of Johannesburg; University of South Africa
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade de Lisboa; Centro de Física Nuclear da Universidade de Lisboa
- Grenoble INP; Department of Physics
- University of Adelaide; University of Iowa
- University of Victoria; Institute of Particle Physics (IPP)
- Kyushu University
- Université Mohamed Premier
- Rutherford Appleton Laboratory; University of Warwick
- Brookhaven National Laboratory; University of Colorado Boulder
- Universidad Antonio Nariño
- CERN; Université de Genève
- University of Alberta
- iThemba Labs
- University of Sydney
- Deutsches Elektronen-Synchrotron DESY; Universität Hamburg
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade do Minho; Centre of Physics of the Universities of Minho and Porto (CF-UM-UP)
- Transilvania University of Brasov
- Physics Department
- Deutsches Elektronen-Synchrotron DESY; University of Chinese Academy of Science (UCAS)
- Georg-August-Universität Göttingen; University of Uppsala
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Centro de Física Nuclear da Universidade de Lisboa
- University of Toronto; TRIUMF
- Southern Methodist University; Université Paris-Saclay
- University of Adelaide; Oxford University
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN; Institute for Nuclear Research and Nuclear Energy (INRNE) of the Bulgarian Academy of Sciences
- Ohio State University; Washington College
- University of the Witwatersrand; University of West Attica
- Stockholm University
- Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR)
- Millennium Institute for Subatomic Physics at High Energy Frontier (SAPHIR); Universidad de La Serena
- Khalifa University of Science and Technology
- Simon Fraser University; TRIUMF
- TOBB University of Economics and Technology
- Université Mohammed V; Mohammed VI Polytechnic University
- University of Toronto; Institute of Particle Physics (IPP)
- High Energy Accelerator Research Organization; Nagoya University
- SLAC National Accelerator Laboratory; Stanford University
- Iv. Javakhishvili Tbilisi State University
- Affiliated with an International Laboratory Covered by a Cooperation Agreement with CERN; Mongolian Academy of Sciences
- Pontificia Universidad Católica de Chile
- Tokyo Metropolitan University
- Laboratório de Instrumentação e Física Experimental de Partículas - LIP; Universidade de Coimbra
- University of Iowa
- Department of Physics
A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks $$(a → b\bar{b})$$, is performed using the full Run 2 data sample using a dileptonic decay mode signature. The search covers pseudoscalar boson masses between 12 and 100 GeV and involves both the kinematic regime where the decay products of the pseudoscalar are reconstructed as two standard b-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio BR$$(a → b\bar{b})$$ = 100%, the range of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling defined as the strength modifier of the Standard Model Yukawa coupling.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC02-05CH11231; AC02-76SF00515; FG02-03ER41244
- OSTI ID:
- 3020351
- Journal Information:
- European Physical Journal. C, Particles and Fields (Online), Journal Name: European Physical Journal. C, Particles and Fields (Online) Journal Issue: 8 Vol. 85; ISSN 1434-6052
- Publisher:
- Springer NatureCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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