The ATLAS collaboration (Including: Becker, K., Facini, G., Harrison, P. F., Jones, E., Martin, T. A., Morgenstern, S., Murray, W. J., Roberts, B. A. , Spangenberg, M. and Vladimirov, V. E.). (2022) Search for type-III seesaw heavy leptons in leptonic final states in pp collisions at s√=13 TeV with the ATLAS detector. The European Physical Journal C, 82 (11). 988. doi:10.1140/epjc/s10052-022-10785-0 ISSN 1434-6044.

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Abstract

A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton–proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139fb−1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Particles (Nuclear physics), Leptons (Nuclear physics), Neutrinos -- Research
Journal or Publication Title:	The European Physical Journal C
Publisher:	Springer
ISSN:	1434-6044
Official Date:	3 November 2022
Dates:	Date Event 3 November 2022 Published 5 September 2022 Accepted
Volume:	82
Number:	11
Article Number:	988
DOI:	10.1140/epjc/s10052-022-10785-0
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access (Creative Commons)
Date of first compliant deposit:	22 December 2022
Date of first compliant Open Access:	22 December 2022
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID UNSPECIFIED Agencia Nacional de Promoción Científica y Tecnológica http://dx.doi.org/10.13039/501100003074 UNSPECIFIED Erewani Fizikayi Institowt http://viaf.org/viaf/138989470 UNSPECIFIED [ARC] Australian Research Council http://dx.doi.org/10.13039/501100000923 UNSPECIFIED Bundesministerium für Wissenschaft, Forschung und Wirtschaft http://dx.doi.org/10.13039/501100003413 UNSPECIFIED Austrian Science Fund http://dx.doi.org/10.13039/501100002428 UNSPECIFIED Azärbaycan Milli Elmlär Akademiyası http://viaf.org/viaf/168770251 UNSPECIFIED Belarus. Gosudarstvennyĭ komitet po nauke i tekhnologii︠a︡m http://viaf.org/viaf/154732294 UNSPECIFIED Conselho Nacional de Desenvolvimento Científico e Tecnológico http://dx.doi.org/10.13039/501100003593 UNSPECIFIED Fundação de Amparo à Pesquisa do Estado de São Paulo http://dx.doi.org/10.13039/501100001807 UNSPECIFIED [NSERC] Natural Sciences and Engineering Research Council of Canada http://dx.doi.org/10.13039/501100000038 UNSPECIFIED [NRC] National Research Council Canada http://dx.doi.org/10.13039/501100000046 UNSPECIFIED [CFI] Canada Foundation for Innovation http://dx.doi.org/10.13039/501100000196 UNSPECIFIED CERN http://dx.doi.org/10.13039/100012470 UNSPECIFIED Agencia Nacional de Investigación y Desarrollo UNSPECIFIED UNSPECIFIED [CAS] Chinese Academy of Sciences http://dx.doi.org/10.13039/501100002367 UNSPECIFIED [MSTPRC] Ministry of Science and Technology of the People's Republic of China http://dx.doi.org/10.13039/501100002855 UNSPECIFIED [NSFC] National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 UNSPECIFIED Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS) http://dx.doi.org/10.13039/100007637 UNSPECIFIED Ministerstvo Školství, Mládeže a Tělovýchovy http://dx.doi.org/10.13039/501100001823 UNSPECIFIED Danmarks Grundforskningsfond http://dx.doi.org/10.13039/501100001732 UNSPECIFIED Natur og Univers, Det Frie Forskningsråd http://dx.doi.org/10.13039/100008394 UNSPECIFIED [IN2P3] Institut national de physique nucléaire et de physique des particules http://viaf.org/viaf/137207166 UNSPECIFIED [CNRS] Centre National de la Recherche Scientifique http://dx.doi.org/10.13039/501100004794 UNSPECIFIED [CEA] Commissariat à l'Énergie Atomique et aux Énergies Alternatives http://dx.doi.org/10.13039/501100006489 UNSPECIFIED Institut de recherche sur les lois fondamentales de l'univers UNSPECIFIED UNSPECIFIED Shota Rustaveli National Science Foundation http://dx.doi.org/10.13039/501100004801 UNSPECIFIED Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347 UNSPECIFIED Helmholtz-Gemeinschaft http://dx.doi.org/10.13039/501100001656 UNSPECIFIED Max-Planck-Gesellschaft http://dx.doi.org/10.13039/501100004189 UNSPECIFIED General Secretariat for Research and Technology http://dx.doi.org/10.13039/501100003448 UNSPECIFIED Research Grants Council, University Grants Committee http://dx.doi.org/10.13039/501100002920 UNSPECIFIED Special Administrative Regions of China UNSPECIFIED UNSPECIFIED Israel Science Foundation http://dx.doi.org/10.13039/501100003977 UNSPECIFIED Weizmann Institute of Science http://dx.doi.org/10.13039/501100001735 UNSPECIFIED [INFN] Instituto Nazionale di Fisica Nucleare http://dx.doi.org/10.13039/501100004007 UNSPECIFIED [MEXT] Ministry of Education, Culture, Sports, Science and Technology http://dx.doi.org/10.13039/501100001700 UNSPECIFIED [JSPS] Japan Society for the Promotion of Science http://dx.doi.org/10.13039/501100001691 UNSPECIFIED 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UNSPECIFIED Türkiye Atom Enerjisi Kurumu http://dx.doi.org/10.13039/100010440 UNSPECIFIED [STFC] Science and Technology Facilities Council http://dx.doi.org/10.13039/501100000271 UNSPECIFIED [DOE] U.S. Department of Energy http://dx.doi.org/10.13039/100000015 UNSPECIFIED [NSF] National Science Foundation (US) http://dx.doi.org/10.13039/100000001 UNSPECIFIED British Columbia Knowledge Development Fund http://dx.doi.org/10.13039/501100007711 UNSPECIFIED Canarie http://dx.doi.org/10.13039/100008313 UNSPECIFIED Compute Canada http://dx.doi.org/10.13039/100013020 UNSPECIFIED Canada Research Chairs http://dx.doi.org/10.13039/501100001804 UNSPECIFIED European Cooperation in Science and Technology http://dx.doi.org/10.13039/501100000921 UNSPECIFIED European Research Council http://dx.doi.org/10.13039/501100000781 UNSPECIFIED [ERDF] European Regional Development Fund http://dx.doi.org/10.13039/501100008530 UNSPECIFIED H2020 Marie Skłodowska-Curie Actions http://dx.doi.org/10.13039/100010665 UNSPECIFIED European Commission http://dx.doi.org/10.13039/501100000780 UNSPECIFIED Investissements d'Avenir Labex and Idex UNSPECIFIED UNSPECIFIED [ANR] Agence Nationale de la Recherche http://dx.doi.org/10.13039/501100001665 UNSPECIFIED [DFG] Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 UNSPECIFIED Alexander von Humboldt-Stiftung http://dx.doi.org/10.13039/100005156 UNSPECIFIED European Social Fund http://dx.doi.org/10.13039/501100004895 UNSPECIFIED National Strategic Reference Framework UNSPECIFIED UNSPECIFIED United States-Israel Binational Science Foundation http://dx.doi.org/10.13039/501100001742 UNSPECIFIED German-Israeli Foundation for Scientific Research and Development http://dx.doi.org/10.13039/501100001736 UNSPECIFIED Narodowe Centrum Nauki http://dx.doi.org/10.13039/501100004281 UNSPECIFIED Narodowa Agencja Wymiany Akademickiej UNSPECIFIED UNSPECIFIED Generalitat de Catalunya http://dx.doi.org/10.13039/501100002809 UNSPECIFIED Generalitat Valenciana http://dx.doi.org/10.13039/501100003359 UNSPECIFIED Göran Gustafssons Stiftelse UNSPECIFIED UNSPECIFIED [RS] Royal Society http://dx.doi.org/10.13039/501100000288 UNSPECIFIED Leverhulme Trust http://dx.doi.org/10.13039/501100000275
Contributors:	Contribution Name Contributor ID Research Group The ATLAS collaboration, UNSPECIFIED

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