Search for single-production of vector-like quarks decaying into Wb in the fully hadronic final state in pp collisions at s = 13 TeV with the ATLAS detector

A bstract A search for T and Y vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of 13 TeV and decaying into Wb in the fully hadronic final state is presented. The search uses 139 fb − 1 of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying W boson with large Lorentz boost and a b -tagged jet, which are used to reconstruct the invariant mass of the vector-like quark candidate. The main background is QCD multijet production, which is estimated using a data-driven method. Upon finding no significant excess in data, mass limits at 95% confidence level are obtained as a function of the global coupling parameter, κ . The observed lower limits on the masses of Y quarks with κ = 0 . 5 and κ = 0 . 7 are 2 . 0 TeV and 2 . 4 TeV, respectively. For T quarks, the observed mass limits are 1 . 4 TeV for κ = 0 . 5 and 1 . 9 TeV for κ = 0 . 7.

Publication Details

Journal
White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Published
2024-10-01
Primary Topic
Particle physics theoretical and experimental studies
Type
article
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article

Search for single-production of vector-like quarks decaying into Wb in the fully hadronic final state in pp collisions at s = 13 TeV with the ATLAS detector

White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Particle physics theoretical and experimental studies
article

Search for single-production of vector-like quarks decaying into Wb in the fully hadronic final state in pp collisions at s = 13 TeV with the ATLAS detector

article en

Abstract

A bstract A search for T and Y vector-like quarks produced in proton-proton collisions at a centre-of-mass energy of 13 TeV and decaying into Wb in the fully hadronic final state is presented. The search uses 139 fb − 1 of data collected by the ATLAS detector at the LHC from 2015 to 2018. The final state is characterised by a hadronically decaying W boson with large Lorentz boost and a b -tagged jet, which are used to reconstruct the invariant mass of the vector-like quark candidate. The main background is QCD multijet production, which is estimated using a data-driven method. Upon finding no significant excess in data, mass limits at 95% confidence level are obtained as a function of the global coupling parameter, κ . The observed lower limits on the masses of Y quarks with κ = 0 . 5 and κ = 0 . 7 are 2 . 0 TeV and 2 . 4 TeV, respectively. For T quarks, the observed mass limits are 1 . 4 TeV for κ = 0 . 5 and 1 . 9 TeV for κ = 0 . 7.

White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, University of Pennsylvania, Ohio State University, Northern Illinois University, Oklahoma State University, Università degli Studi di Napoli Federico II, Harvard University, Univerzita Karlova v Praze, Aix-Marseille Université, Univerzita Komenského v Bratislave, České Vysoké Učení Technické v Praze, Michigan State University, University of Washington, Brandeis University, University of Pittsburgh, University of Oklahoma, Canarie, Baden-Württemberg Stiftung, McGill University, Universidad Técnica Federico Santa María, University of Bern, Justus Liebig Universität Gießen, Shandong University, Queen Mary University of London, Iowa State University, University of Texas at Arlington, Slovenská Akadémia Vied, University of Oregon, New York University Abu Dhabi, TRIUMF, CERN, Université Grenoble Alpes, UK Research and Innovation, Centres de Recerca de Catalunya, Université Mohammed VI Polytechnique, 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Academy of Sciences, Universität Innsbruck, National University of Science and Technology, Istituto Nazionale di Fisica Nucleare, Narodowa Agencja Wymiany Akademickiej, Université Cadi Ayyad, University of Zululand, Technische Universität Dortmund, Université Hassan II de Casablanca, Shanghai Key Laboratory for Particle Physics and Cosmology, National Technical University of Athens, Sorbonne Université, Agencia Nacional de Investigación y Desarrollo, National Science and Technology Council, Institut de Física d'Altes Energies, Ministero dell'Università e della Ricerca, Stony Brook University, University of Illinois at Urbana-Champaign, College of Engineering, Michigan State University, University of California, Irvine, Horizon 2020 Framework Programme, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Agencia 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