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Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector

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248Institutions déclarées
45Pays d’affiliation déclarés

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Abstract The existence of right-handed neutrinos with Majorana masses below the electroweak scale could help address the origins of neutrino masses, the matter–antimatter asymmetry, and dark matter. In this paper, leptonic decays of W bosons from 140 fb $$^{-1}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:mmultiscripts> </mml:math> of 13 TeV proton–proton collisions at the LHC, reconstructed in the ATLAS experiment, are used to search for heavy neutral leptons produced through their mixing with muon or electron neutrinos in a scenario with lepton number violation. The search is conducted using prompt leptonic decay signatures. The considered final states require two same-charge leptons or three leptons, while vetoing three-lepton same-flavour topologies. No significant excess over the expected Standard Model backgrounds is found, leading to constraints on the heavy neutral lepton’s mixing with muon and electron neutrinos for heavy-neutral-lepton masses. The analysis excludes $$|U_{e}|^2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msub> <mml:mi>U</mml:mi> <mml:mi>e</mml:mi> </mml:msub> <mml:msup> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> values above $$8\times 10^{-5}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>8</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>5</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> and $$|U_{\mu }|^2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msub> <mml:mi>U</mml:mi> <mml:mi>μ</mml:mi> </mml:msub> <mml:msup> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> </mml:mrow> </mml:math> values above $$5.0 \times 10^{-5}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>5.0</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>5</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> in the full mass range of 8–65 GeV. The strongest constraints are placed on heavy-neutral-lepton masses in the range 15–30 GeV of $$|U_{e}|^2 &lt; 1.1 \times 10^{-5}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msub> <mml:mi>U</mml:mi> <mml:mi>e</mml:mi> </mml:msub> <mml:msup> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>&lt;</mml:mo> <mml:mn>1.1</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>5</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> and $$|U_{\mu }|^2 &lt; 5 \times 10^{-6}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:msub> <mml:mi>U</mml:mi> <mml:mi>μ</mml:mi> </mml:msub> <mml:msup> <mml:mrow> <mml:mo>|</mml:mo> </mml:mrow> <mml:mn>2</mml:mn> </mml:msup> <mml:mo>&lt;</mml:mo> <mml:mn>5</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>6</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> .

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Contrôle bibliographique ouvert

DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.

Titre Crossref
Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt signatures in the ATLAS detector
Date Crossref
14/02/2026
Éditeur
Springer Science and Business Media LLC
Type
journal-article

Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude et ne compte pas comme une seconde source scientifique indépendante.

Institutions déclarées

Aix-Marseille UniversitéUniversity of BergenUniversity of OklahomaNew York UniversityUniversity of GöttingenTU Dortmund UniversityBrookhaven National LaboratorySouthern Methodist UniversityMohammed V UniversityTel Aviv UniversityKing's College LondonIstituto Nazionale di Fisica Nucleare, Sezione di TriesteHeidelberg UniversityUniversité Savoie Mont BlancJagiellonian UniversityAGH University of KrakowSLAC National Accelerator LaboratoryUniversity of ManchesterNorthern Illinois UniversityIstanbul UniversityRutherford Appleton LaboratoryUniversity of California, Santa CruzUniversity of ChicagoBarcelona Institute of Science and TechnologyInstitute of Science and TechnologyJohannes Gutenberg University MainzAlexandru Ioan Cuza UniversityAzerbaijan National Academy of SciencesEuropean Organization for Nuclear ResearchRoyal Holloway University of LondonUniversity of Rome Tor VergataIstituto Nazionale di Fisica Nucleare, Roma Tor VergataUniversitat de ValènciaLund UniversityStony Brook UniversityWaseda UniversityUniversity of BonnUniversity of WürzburgIstituto Nazionale di Fisica Nucleare, Sezione di BolognaUniversity of VictoriaUniversity of BernIstituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiInstitut des langues et cultures d'Europe, Amérique, Afrique, Asie et AustralieUniversité Grenoble AlpesUniversity of EdinburghOklahoma State University Oklahoma CityHoria Hulubei National Institute for R and D in Physics and Nuclear EngineeringFZU ‒ Institute of Physics of the Academy of Sciences of the Czech RepublicNational Technical University of AthensUniversity of GenevaUniversity of WarwickCzech Technical University in PragueIslamic UniversityLancaster UniversityCalifornia State University SystemUniversity of LiverpoolUniversity of JohannesburgIstituto Nazionale di Fisica Nucleare, Sezione di MilanoUniversité Paris-SaclayUniversity of SussexUniversity of BirminghamIstituto Nazionale di Fisica Nucleare, Sezione di NapoliConsejo Nacional de Investigaciones Científicas y TécnicasUniversidad Nacional de La PlataUniversity of WashingtonUniversidade Federal do Rio de JaneiroMcGill UniversityLudwig-Maximilians-Universität MünchenUniversité Paris CitéSorbonne UniversitéUniversity of MichiganUniversity of FreiburgUniversity of TorontoLIP - Laboratory of Instrumentation and Experimental Particle PhysicsAristotle University of ThessalonikiHigh Energy Accelerator Research OrganizationUniversity of SheffieldThe University of Texas at AustinUniversity of GlasgowUniversity of MilanNational and Kapodistrian University of AthensColumbia UniversityIstituto Nazionale di Fisica Nucleare, Sezione di PisaIstituto Nazionale di Fisica Nucleare, Sezione di Roma IThe University of TokyoDeutsches Elektronen-Synchrotron DESYUniversidad de Buenos AiresBrandeis UniversityInstitute of Nuclear Physics, Polish Academy of SciencesDuke UniversityUniversité de MontréalSapienza University of RomeNagoya UniversityOchanomizu UniversityA. Alikhanyan National LaboratoryComenius University BratislavaUniversity of California, IrvineUniversity of Cape TownThe Polytechnic University of JapanUniversité Mohammed VI PolytechniqueCalifornia University of PennsylvaniaUniversité Clermont AuvergneSlovak Academy of SciencesInstitute of Experimental Physics of the Slovak Academy of SciencesUniversity of ThessalyCarleton UniversityTechnische Universität DresdenHumboldt-Universität zu BerlinQueen Mary University of LondonYale UniversityUniversity of BelgradeThe University of Texas at ArlingtonUniversity of BolognaUniversity of CambridgeUnited Arab Emirates UniversityUniversity of PittsburghThe University of MelbourneUniversity of California SystemNational Institute for Subatomic PhysicsMax Planck Institute for PhysicsUniversity of Science and Technology of ChinaUniversity of OxfordUniversity College LondonUniversidad Autónoma de MadridChinese Academy of SciencesAn-Najah National UniversityUniversity of British ColumbiaUniversität InnsbruckTufts UniversityUniversity of FribourgIstinye UniversityUniversidade do Estado do Rio de JaneiroIndiana UniversityHarvard University PressUppsala UniversityLawrence Berkeley National LaboratoryIstituto Nazionale di Fisica Nucleare, Sezione di Roma TreUniversity of WuppertalGaziantep UniversityWeizmann Institute of ScienceUniversity of SiegenFolkwang University of the ArtsIstituto Nazionale di Fisica Nucleare, Sezione di GenovaUniversity of GenoaThe Ohio State UniversityUniversity of TrentoIstituto Nazionale di Fisica Nucleare, Trento Institute for Fundamental Physics And ApplicationsMichigan State UniversityYork UniversityStockholm UniversityUniversité Fédérale de Toulouse Midi-PyrénéesUniversity of Illinois SystemSimon Fraser UniversityUniversity of Chinese Academy of SciencesNanjing UniversityAnkara UniversityUniversity of CopenhagenIstituto Nazionale di Fisica Nucleare, Gruppo Collegato di CosenzaUniversity of CalabriaWestmont CollegeRadboud University NijmegenUniversidad Técnica Federico Santa MaríaUniversity of PaviaIstituto Nazionale di Fisica Nucleare, Sezione di PaviaUniversitat Autònoma de BarcelonaUniversity of MinhoUniversity of OsloUniversidad Nacional de ColombiaPalacký University OlomoucUniversidade Federal de Juiz de ForaUniversity of PisaTbilisi State UniversityArgonne National LaboratoryShanghai Jiao Tong UniversityKyoto UniversityCollaborative Innovation Center of Quantum MatterTsinghua UniversityChinese University of Hong KongUniversity of ArizonaNational Tsing Hua UniversityIstituto Nazionale di Fisica Nucleare, Sezione di LecceUniversity of LjubljanaUniversity of UdineUniversity of SalentoUniversity of LisbonParthenope University of NaplesInstitute of Particle PhysicsAcademia SinicaBoğaziçi UniversityBolu Abant İzzet Baysal UniversityThe University of AdelaideRoma Tre UniversityPontificia Universidad Católica de ChileMillennium InstituteKTH Royal Institute of TechnologyUniversidade Federal da BahiaUniversity of BucharestUniversité Ibn-TofailUniversity of Hong KongLouisiana Tech UniversityShandong UniversityCentro Nacional de MicroelectrónicaInstitut de Microelectrònica de BarcelonaCity University of New YorkUniversity of CoimbraUniversity of the Philippines DilimanUniversity of the AegeanUniversity of SharjahNational Centre of Scientific Research "Demokritos"University of AlbertaWest University of TimişoaraInstitució Catalana de Recerca i Estudis AvançatsSun Yat-sen UniversityHenan UniversityŌtani UniversityUniversity of TsukubaNational University of Science and TechnologyUniversity of La SerenaIlia State UniversityUniversity of TarapacáTechnion – Israel Institute of TechnologyUniversity of the WitwatersrandIowa State UniversityKobe UniversityHellenic Open UniversityUniversidade de São PauloHong Kong University of Science and TechnologyUniversity of South AfricaUniversity of IowaKyushu UniversityPremier UniversityUniversity of Colorado BoulderUniversity of Colorado SystemUniversidad Antonio NariñoiThemba LaboratoryThe University of SydneyUniversität HamburgTransylvania University of BrașovBulgarian Academy of SciencesInstitute for Nuclear Research and Nuclear EnergyWashington CollegeUniversity of West AtticaKhalifa University of Science and TechnologyJustus-Liebig-Universität GießenTOBB University of Economics and TechnologyStanford UniversityMongolian Academy of SciencesTokyo Metropolitan University

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