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Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at $ \sqrt{s} $ = 13 TeV

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206Institutions déclarées
50Pays d’affiliation déclarés

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A search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb$^{−1}$ collected at $ \sqrt{s} $ = 13 TeV with the CMS detector at the CERN LHC is presented. Events are selected with a charged lepton originating from the primary vertex associated with the proton-proton interaction, as well as a second charged lepton and a hadronic jet associated with a secondary vertex that corresponds to the semileptonic decay of a long-lived HNL. No excess of events above the standard model expectation is observed. Exclusion limits at 95% confidence level are evaluated for HNLs that mix with electron and/or muon neutrinos. Limits are presented in the mass range of 1–16.5 GeV, with excluded square mixing parameter values reaching as low as 2 × 10$^{−7}$. For masses above 11 GeV, the presented limits exceed all previous results in the semileptonic decay channel, and for some of the considered scenarios are the strongest to date.[graphic not available: see fulltext]

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Institutions déclarées

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Alikhanyan National LaboratoryTU WienUniversity of AntwerpVrije Universiteit BrusselGene Therapy LaboratoryEuropean Union of Medical SpecialistsUCLouvainUniversidade do Estado do Rio de JaneiroSofie Biosciences (United States)SurgOne Foregut InstituteUniversity of TarapacáBeihang UniversityTsinghua UniversityNanjing Normal UniversityInstitute of High Energy PhysicsSouth China Normal UniversityFudan UniversityEIA UniversityUniversidad de AntioquiaUniversity of SplitRuđer Bošković InstituteUniversity of CyprusCharles UniversitySt. Charles HospitalUniversidad San Francisco de QuitoSuez Canal UniversityBritish University in EgyptModern AcademyFayoum UniversityNational Institute of Chemical Physics and BiophysicsHelsinki Institute of PhysicsLappeenranta-Lahti University of TechnologyInstitut de Recherche sur les Lois Fondamentales de l'UniversPurdue University West LafayetteÉcole PolytechniqueUniversité de Haute-AlsaceInstitut Pluridisciplinaire Hubert CurienInstitute of Nuclear Physics of LyonInstitut de Physique des 2 Infinis de LyonIstinye UniversityGeorgian Technical UniversityFH AachenRWTH Aachen UniversityBrandenburg University of Applied SciencesForschungszentrum JülichKarlsruhe Institute of TechnologyDemocritus University of ThraceAthens State UniversityNTL Institute for Applied Behavioral ScienceAbiola Ajimobi Technical University IbadanUniversity of IoanninaInstitute for Particle and Nuclear PhysicsEötvös Loránd UniversityUniversity of DebrecenPanjab UniversityUniversity of DelhiVisva-Bharati UniversityIndian Institute of Technology MadrasIndian Institute of Management BangaloreIndian Institute of Science BangaloreTata Institute of Fundamental ResearchNational Institute of Science Education and ResearchIndian Institute of Technology BhubaneswarInstitute of Physics, BhubaneshwarIndian Institute of Science Education and Research PuneIsfahan University of TechnologySharif University of TechnologyUniversity of Science and Technology of MazandaranUniversity College DublinIstituto Nazionale di Fisica Nucleare, Sezione di BariUniversity of Bari Aldo MoroHelwan UniversityIstituto Nazionale di Fisica Nucleare, Sezione di BolognaIstituto Nazionale di Fisica Nucleare, Sezione di CataniaFlorence (Netherlands)Frascati ScienzaMarconi UniversityLaboratori Guglielmo Marconi (Italy)Genoa (Brazil)Istituto Nazionale di Fisica Nucleare, Sezione di GenovaIstituto Nazionale di Fisica Nucleare, Sezione di Milano BicoccaNaples Anesthesia & Physician AssociatesFermi National Accelerator LaboratoryIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di LegnaroIstituto Nazionale di Fisica Nucleare, Sezione di PaviaIstituto Nazionale di Fisica Nucleare, Sezione di PerugiaIstituto Nazionale di Fisica Nucleare, Sezione di PisaScuola Normale SuperioreIstituto Nazionale di Fisica Nucleare, Sezione di Roma IIstituto Nazionale di Fisica Nucleare, Sezione di TorinoUniversity of TurinIstituto Nazionale di Fisica Nucleare, Sezione di TriesteGangneung–Wonju National UniversityChonnam National UniversityChonnam National University HospitalHanyang UniversityKyung Hee UniversitySejong UniversityUniversity of SeoulYonsei UniversitySungkyunkwan UniversityRiga High Tech UniversityVilnius UniversityVilnius University of Applied SciencesMalayan Colleges LagunaUniversity of MalayaUniversitas MalahayatiUniversidad de SonoraCentro de Investigación y de Estudios Avanzados del Instituto Politécnico NacionalSecretaría de Ciencia, Humanidades, Tecnología e InnovaciónIbero American UniversityUniversidad IberoamericanaUniversidad de PueblaUniversity of MontenegroCanterbury CollegeQuaid-i-Azam UniversityAGH University of KrakowNational Centre for Nuclear ResearchUniversity of WarsawWarsaw University of TechnologyTechin (Poland)LIP - Laboratory of Instrumentation and Experimental Particle PhysicsUniversity of BelgradeGrade Medical (Czechia)Ipca Laboratories (India)Vienna Institute for Nature Conservation & AnalysesUnidades Centrales Científico-TécnicasCentro de Investigaciones Energéticas, Medioambientales y TecnológicasUniversidad Autónoma de MadridUniversidad de OviedoInstituto de Física de CantabriaUniversity of ColomboUniversity of RuhunaETH ZurichStefan Meyer Institute for Subatomic PhysicsNational Central UniversityLaboratoire d’Annecy de Physique des ParticulesNational Taiwan UniversityChulalongkorn UniversityCukurova UniversityAdıyaman UniversityMiddle East Technical UniversityBoğaziçi UniversityMarmara UniversityKafkas UniversityIstanbul Technical UniversityHacettepe UniversityErzincan Binali Yıldırım UniversityYıldız Technical UniversityInstitute for Scintillation MaterialsAt BristolUniversity of BristolBristol HospitalSaint Thomas - Rutherford HospitalUniversity of SouthamptonBrunel University of LondonUniversidad de AméricaUniversity of AlabamaUniversity of West AlabamaBoston UniversityBrown UniversityBethel CollegeBethel UniversityShorter CollegeBethel UniversityKaramanoğlu Mehmetbey UniversityUniversity of California, DavisUniversity of California, RiversideUniversity of California San DiegoUniversity of California, Santa BarbaraCalifornia Institute of TechnologyCarnegie Mellon UniversityUniversity of Colorado SystemCornell UniversityUnited States Naval AcademyFlorida Department of StateFlorida Institute of TechnologyAin Shams UniversityUniversity of ChicagoBingöl UniversitySinop UniversityJohns Hopkins UniversityJohns Hopkins University School of Advanced International StudiesUniversity of KansasHoria Hulubei National Institute for R and D in Physics and Nuclear EngineeringUniversity of Minnesota SystemUniversity of Nebraska–LincolnUniversity of Nebraska SystemBuffalo State UniversityUniversity at Buffalo, State University of New YorkNorthwestern UniversityNotre Dame of Dadiangas UniversityState Library of OhioUniversity of Puerto Rico-MayaguezPurdue University NorthwestRice UniversityUniversity of RochesterRutgers, The State University of New JerseyRutgers Sexual and Reproductive Health and RightsUniversity of Tennessee SystemTexas A&M University at QatarTexas Tech UniversityVanderbilt HealthUrology of VirginiaWayne State CollegeUniversity of Wisconsin System

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