Search for R-parity violating supersymmetric decays of the top squark to a b-jet and a lepton in s =13 TeV pp collisions with the ATLAS detector

A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an R-parity violating coupling to a charged lepton and a b-quark.The dataset corresponds to an integrated luminosity of 140 fb -1 of proton-proton collisions at a centerof-mass energy of ffiffi ffi s p 13 TeV collected between 2015 and 2018 by the ATLAS detector at the LHC.The final state has two charged leptons (electrons or muons) and two b-jets.The results of the search are interpreted in the context of a Minimal Supersymmetric Standard Model with an additional B -L gauge symmetry that is spontaneously broken.No significant excess is observed over the Standard Model background, and exclusion limits on stop pair production are set at 95% confidence level.The corresponding lower limits on the stop mass for 100% branching ratios to a b-quark and an electron, muon, or tau-lepton are 1.9 TeV, 1.8 TeV and 800 GeV, respectively, extending the reach of previous LHC searches.

Publication Details

Journal
White Rose Research Online (University of Leeds, The University of Sheffield, University of York)
Published
2024-11-12
Primary Topic
Particle physics theoretical and experimental studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Search for R-parity violating supersymmetric decays of the top squark to a b-jet and a lepton in s =13 TeV pp collisions 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 R-parity violating supersymmetric decays of the top squark to a b-jet and a lepton in s =13 TeV pp collisions with the ATLAS detector

article en

Abstract

A search is presented for direct pair production of the stop, the supersymmetric partner of the top quark, in a decay through an R-parity violating coupling to a charged lepton and a b-quark.The dataset corresponds to an integrated luminosity of 140 fb -1 of proton-proton collisions at a centerof-mass energy of ffiffi ffi s p 13 TeV collected between 2015 and 2018 by the ATLAS detector at the LHC.The final state has two charged leptons (electrons or muons) and two b-jets.The results of the search are interpreted in the context of a Minimal Supersymmetric Standard Model with an additional B -L gauge symmetry that is spontaneously broken.No significant excess is observed over the Standard Model background, and exclusion limits on stop pair production are set at 95% confidence level.The corresponding lower limits on the stop mass for 100% branching ratios to a b-quark and an electron, muon, or tau-lepton are 1.9 TeV, 1.8 TeV and 800 GeV, respectively, extending the reach of previous LHC searches.

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, Canarie, Baden-Württemberg Stiftung, 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, Bundesministerium für Bildung und Forschung, 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, Israel Science Foundation, Knut och Alice Wallenbergs Stiftelse, Max-Planck-Gesellschaft, Javna Agencija za Raziskovalno Dejavnost RS, Vetenskapsrådet, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Norges Forskningsråd, Centre National pour la Recherche Scientifique et Technique, Forskningsrådet om Hälsa, Arbetsliv och Välfärd, Istituto Nazionale di Fisica Nucleare, 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, H2020 Marie Skłodowska-Curie Actions, CHIST-ERA
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