Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 fb$^{−1}$ of pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

A bstract This paper presents a search for massive, charged, long-lived particles with the ATLAS detector at the Large Hadron Collider using an integrated luminosity of 140 fb − 1 of proton-proton collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV. These particles are expected to move significantly slower than the speed of light. In this paper, two signal regions provide complementary sensitivity. In one region, events are selected with at least one charged-particle track with high transverse momentum, large specific ionisation measured in the pixel detector, and time of flight to the hadronic calorimeter inconsistent with the speed of light. In the other region, events are selected with at least two tracks of opposite charge which both have a high transverse momentum and an anomalously large specific ionisation. The search is sensitive to particles with lifetimes greater than about 3 ns with masses ranging from 200 GeV to 3 TeV. The results are interpreted to set constraints on the supersymmetric pair production of long-lived R-hadrons, charginos and staus, with mass limits extending beyond those from previous searches in broad ranges of lifetime.

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Journal
Apollo (University of Cambridge)
Published
2025-01-01
Primary Topic
Prenatal Screening and Diagnostics
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article
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article

Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 fb$^{−1}$ of pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

Apollo (University of Cambridge)
Prenatal Screening and Diagnostics
article

Search for long-lived charged particles using large specific ionisation loss and time of flight in 140 fb$^{−1}$ of pp collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector

article en

Abstract

A bstract This paper presents a search for massive, charged, long-lived particles with the ATLAS detector at the Large Hadron Collider using an integrated luminosity of 140 fb − 1 of proton-proton collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV. These particles are expected to move significantly slower than the speed of light. In this paper, two signal regions provide complementary sensitivity. In one region, events are selected with at least one charged-particle track with high transverse momentum, large specific ionisation measured in the pixel detector, and time of flight to the hadronic calorimeter inconsistent with the speed of light. In the other region, events are selected with at least two tracks of opposite charge which both have a high transverse momentum and an anomalously large specific ionisation. The search is sensitive to particles with lifetimes greater than about 3 ns with masses ranging from 200 GeV to 3 TeV. The results are interpreted to set constraints on the supersymmetric pair production of long-lived R-hadrons, charginos and staus, with mass limits extending beyond those from previous searches in broad ranges of lifetime.

Apollo (University of Cambridge)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, University of Pennsylvania, Ohio State University, Northern Illinois University, Oklahoma State University, Univerzita Karlova v Praze, Aix-Marseille Université, Ankara Universitesi, České Vysoké Učení Technické v Praze, Michigan State University, University of Washington, University of Pittsburgh, University of Oklahoma, Canarie, Baden-Württemberg Stiftung, McGill University, Universidad Técnica Federico Santa María, University of Bern, Shandong University, Queen Mary University of London, University of Texas at Arlington, University of Oregon, New York University Abu Dhabi, TRIUMF, CERN, UK Research and Innovation, Centres de Recerca de Catalunya, Institut "Jožef Stefan", Université Savoie Mont Blanc, Universität Siegen, Louisiana Tech University, Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu, York University, University of Alberta, Leverhulme Trust, Royal Society, University College London, University of Oxford, European Commission, University of Sussex, 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, Universiteit van Amsterdam, Radboud Universiteit, Academia Sinica, Bundesministerium für Bildung und Forschung, Chinese Academy of Sciences, Sun Yat-sen University, Austrian Science Fund, Carl Tryggers Stiftelse för Vetenskaplig Forskning, Generalitat de Catalunya, Ministry of Science and Technology of the People's Republic of China, Consejo Nacional de Investigaciones Científicas y Técnicas, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Lunds Universitet, Generalitat Valenciana, Bundesministerium für Wissenschaft, Forschung und Wirtschaft, University of Toronto, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Universidad Nacional de La Plata, Knut och Alice Wallenbergs Stiftelse, Khalifa University of Science, Technology and Research, Tsinghua University, Max-Planck-Gesellschaft, Akademie Věd České Republiky, Kungliga Tekniska Högskolan, Simon Fraser University, Vetenskapsrådet, Tel Aviv University, Ministry of Education, India, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Universidad Autónoma de Madrid, Zhengzhou University, Université de Toulouse, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Shanghai Jiao Tong University, Universitetet i Bergen, National and Kapodistrian University of Athens, Universitetet i Oslo, Norges Forskningsråd, Universidade de São Paulo, Ludwig-Maximilians-Universität München, Universidade de Coimbra, Universidade de Lisboa, United Arab Emirates University, Technion-Israel Institute of Technology, Centre National pour la Recherche Scientifique et Technique, Universidad de Granada, Aristotle University of Thessaloniki, University of Tsukuba, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, High Energy Accelerator Research Organization, Universidade do Estado do Rio de Janeiro, Univerzita Palackého v Olomouci, Université Paris-Saclay, Universidad de Tarapacá, Univerza v Ljubljani, Nanjing University, Universidade Federal do Rio de Janeiro, Julius-Maximilians-Universität Würzburg, Universidade do Minho, Pontificia Universidad Católica de Chile, Tokyo Metropolitan University, University of Chinese Academy of Sciences, Istituto Nazionale di Fisica Nucleare, Narodowa Agencja Wymiany Akademickiej, 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, University of West Attica, 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, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Agencia Nacional de Promoción Científica y Tecnológica, Department of Physics and Astronomy, University College London, Instituto Superior Técnico, British Columbia Knowledge Development Fund, European Regional Development Fund, Agencia Estatal de Investigación, Institute of High Energy Physics, Institut National de Physique Nucléaire et de Physique des Particules, Royal Holloway, University of London, Division of Physics, High Energy Physics, Nuclear Physics, European Social Fund, Argonne National Laboratory, Lawrence Berkeley National Laboratory, H2020 European Research Council, H2020 Marie Skłodowska-Curie Actions, SLAC National Accelerator Laboratory, CHIST-ERA
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Prenatal Screening and Diagnostics
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