Search for electroweak production of vector-like leptons in $$\tau $$-lepton and b-jet final states in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector

Abstract A search for pair-production of vector-like leptons is presented, considering their decays into a third-generation Standard Model (SM) quark and a vector leptoquark ( $$U_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>U</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> ) as predicted by an ultraviolet-complete extension of the SM, referred to as the ‘4321’ model. Given the assumed decay of $$U_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>U</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> into third-generation SM fermions, the final state can contain multiple $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -leptons and b -quarks. This search is based on a dataset of pp collisions at $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of up to $$140~\textrm{fb}^{-1} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>140</mml:mn> <mml:mspace/> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> . No significant excess above the SM background prediction is observed, and 95% confidence level limits on the cross-section times branching ratio are derived as a function of the vector-like lepton mass. A lower observed (expected) limit of 910 GeV (970 GeV) is set on the vector-like lepton mass. Additionally, the results are interpreted for a supersymmetric model with an R -parity violating coupling to the third-generation quarks and leptons. Lower observed (expected) limits are obtained on the higgsino mass at 880 GeV (940 GeV) and on the wino mass at 1170 GeV (1170 GeV).

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The European Physical Journal C
Published
2025-11-20
DOI
https://doi.org/10.1140/epjc/s10052-025-14748-z
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Particle physics theoretical and experimental studies
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article
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article

Search for electroweak production of vector-like leptons in $$\tau $$-lepton and b-jet final states in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector

Y. Cao, Yu. Volkotrub, M. Baselga, J. Hoya et al.
The European Physical Journal C
Particle physics theoretical and experimental studies
article

Search for electroweak production of vector-like leptons in $$\tau $$-lepton and b-jet final states in pp collisions at $$\sqrt{s}$$ = 13 TeV with the ATLAS detector

Y. Cao, Yu. Volkotrub, M. Baselga, J. Hoya, G. Aielli, A. D. Auriol, J. Hofer, Anke Ackermann, G. Carlino, A. Roy, F. Curcio, Ali Can Canbay, I. Sýkora, R. Stroynowski, J. C. Rivera Vergara, Mingxu He, S. Díez Cornell, B. P. Kerridge, R. Cardarelli, N. Sur, M. J. Green, Marten Zefanja Barel, Youssef Khoulaki, M. N. Agaras, C. Schiavi, T. Carli, Š. Todorova-Nová, U. Kruchonak, M. Akbiyik, Gianmario Cesarini, T. Berry, A. Ambler, L. M. Baltes, A. Sidoti, O. Arnaez, F. L. Lucio Alves, Zaza Chubinidze, M. Bindi, Paulo César Machado de Abreu Farias, A. Vgenopoulos, M. Bruschi, B. Abbott, A. Cerri, D. Duda, M. Bauce, P. A. Ekman, C. Alexa, O. Jinnouchi, F. Bartels, A. Durglishvili, D. Boscherini, T. Buanes, C. Di Donato, A. Pacheco Pages, S. Singh, S. Alderweireldt, Yixiang Zhang, M. Begel, Marko D. Mihovilovič, A. Carnelli, P. J. Clark, A. L. Sopio, P. A. Bruckman de Renstrom, N. Berger, C. Sawyer, C. E. Jessiman, A. Skaf, Russell Bate, M. Kado, G. Brianti, P. Váňa, Leon Bozianu, G. L. 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article en

Abstract

Abstract A search for pair-production of vector-like leptons is presented, considering their decays into a third-generation Standard Model (SM) quark and a vector leptoquark ( $$U_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>U</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> ) as predicted by an ultraviolet-complete extension of the SM, referred to as the ‘4321’ model. Given the assumed decay of $$U_1$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>U</mml:mi> <mml:mn>1</mml:mn> </mml:msub> </mml:math> into third-generation SM fermions, the final state can contain multiple $$\tau $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> </mml:math> -leptons and b -quarks. This search is based on a dataset of pp collisions at $$\sqrt{s}=13$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:mrow> </mml:math> TeV recorded with the ATLAS detector during Run 2 of the Large Hadron Collider, corresponding to an integrated luminosity of up to $$140~\textrm{fb}^{-1} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>140</mml:mn> <mml:mspace/> <mml:msup> <mml:mtext>fb</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> . No significant excess above the SM background prediction is observed, and 95% confidence level limits on the cross-section times branching ratio are derived as a function of the vector-like lepton mass. A lower observed (expected) limit of 910 GeV (970 GeV) is set on the vector-like lepton mass. Additionally, the results are interpreted for a supersymmetric model with an R -parity violating coupling to the third-generation quarks and leptons. Lower observed (expected) limits are obtained on the higgsino mass at 880 GeV (940 GeV) and on the wino mass at 1170 GeV (1170 GeV).

The European Physical Journal CVol. 85(11)
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of Physics (PL), Max Planck Institute for Physics (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre (IT), Sorbonne Paris Cité (FR), Institute of Experimental Physics of the Slovak Academy of Sciences (SK), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), Istituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And Applications (IT), National Institute for Subatomic Physics (NL), Centre de physique des particules de Marseille (FR), University of West Attica (GR), Istituto Nazionale di Fisica Nucleare, Sezione di Lecce (IT), Institute of Physics and Technology (MN), Institute of Particle Physics (CA), CPC Heilongjiang Provincial Committee Party School (CN), Universidad Antonio Nariño (CO), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Pavia (IT), Instituto de Física La Plata (AR), Institute of Physics, Academia Sinica (TW), Osaka Health Science University (JP), Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata (IT), Institute for Nuclear Research and Nuclear Energy (BG), Indiana University Bloomington (US), The Polytechnic University of Japan (JP), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), University of Georgia (GE), Collaborative Innovation Center of Quantum Matter (CN), CEA Paris-Saclay (FR), Université Mohammed VI Polytechnique (MA), Oklahoma State University Oklahoma City (US), Barcelona Institute of Science and Technology (ES), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Institute of High Energy Physics (CN), Universidad Técnica Federico Santa María (EC), Laboratoire de Physique Subatomique et de Cosmologie (FR), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Centro Nacional de Microelectrónica (ES), National Institute for Research and Development of Isotopic and Molecular Technologies (RO), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), Institut de Microelectrònica de Barcelona (ES), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Ōtani University (JP), University of Chinese Academy of Sciences (CN), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Laboratoire des 2 Infinis Toulouse (FR), Instituto de Física de Buenos Aires (AR), Institute of Science and Technology, Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Udine, Boğaziçi University (TR), University of Bergen (NO), Czech Technical University in Prague (CZ), University College London (GB), University of Calabria (IT), McGill University (CA), The Ohio State University (US), Weizmann Institute of Science (IL), The University of Adelaide (AU), New York University (US), Sofia University "St. Kliment Ohridski" (BG), Indiana University (US), Stony Brook University (US), Gaziantep University (TR), California State University, Long Beach (US), Nagoya University (JP), Universitatea Națională de Știință și Tehnologie Politehnica București (RO), Universidad Autónoma de Madrid (ES), Kobe University (JP), Carleton University (CA), European Organization for Nuclear Research (CH), Lancaster University (GB), Istanbul University (TR), AGH University of Krakow (PL), Brandeis University (US), Tokyo Metropolitan University (JP), Palacký University Olomouc (CZ), Université Savoie Mont Blanc (FR), Université de Montréal (CA), University of Göttingen (DE), Comenius University Bratislava (SK), The University of Tokyo (JP), University of La Serena (CL), Premier University (BD), University of Coimbra (PT), Bolu Abant İzzet Baysal University (TR), Columbia University (US), Technische Universität Dresden (DE), University of Glasgow (GB), University of Pennsylvania (US), University of Birmingham (GB), Ludwig-Maximilians-Universität München (DE), University of Genoa (IT), Academia Sinica (TW), Sapienza University of Rome (IT), The University of Texas at Austin (US), University of Oklahoma (US), KTH Royal Institute of Technology (SE), University of the Philippines Diliman (PH), Michigan State University (US), Universidad Nacional de La Plata (AR), Nanjing University (CN), University of Amsterdam (NL), University of Hong Kong (HK), Université Grenoble Alpes (FR), University of Sheffield (GB), Louisiana Tech University (US), University of Bologna (IT), Westmont College (US), University of California, Berkeley (US), Stanford University (US), The University of Osaka (JP), University of Edinburgh (GB), University of the Aegean (GR), Tsinghua University (CN), University of Hassan II Casablanca (MA), University of Minho (PT)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, Canarie, TRIUMF, CERN, UK Research and Innovation, Centres de Recerca de Catalunya, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, Leverhulme Trust, Royal Society, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Danmarks Grundforskningsfond, Fundação de Amparo à Pesquisa do Estado de São Paulo, National Natural Science Foundation of China, Ministerstvo Školství, Mládeže a Tělovýchovy, Grantová Agentura České Republiky, Austrian Science Fund, Generalitat de Catalunya, Ministry of Science and Technology of the People's Republic of China, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Bundesministerium für Wissenschaft, Forschung und Wirtschaft, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Centre National pour la Recherche Scientifique et Technique, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Narodowa Agencja Wymiany Akademickiej, Agencia Nacional de Investigación y Desarrollo, National Science and Technology Council, Horizon 2020 Framework Programme, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Agencia Nacional de Promoción Científica y Tecnológica, British Columbia Knowledge Development Fund, European Regional Development Fund, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, European Social Fund, H2020 European Research Council
Openalex Percentile: Top 88%
Particle physics theoretical and experimental studies
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