Search for Lepton Number and Flavor Violation in and Decays
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abstract
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Searches for the lepton number violating decay and the lepton flavor violating and decays are reported using data collected by the NA62 experiment at CERN in 2017-2018. No evidence for these decays is found and upper limits of the branching ratios are obtained at 90%25 confidence level: , and . These results improve by 1 order of magnitude over previous results for these decay modes. © 2021 Published by the American Physical Society
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UNCE/SCI/013; 701386, 754496, 842407, 893101; National Science Foundation, NSF: 1506088, 1806430; National Research Centre, NRC; CERN; Ministère de l’Enseignement Supérieur et de la Recherche Scientifique, MESRS; Natural Sciences and Engineering Research Council of Canada, NSERC: SAPPJ-2018-0017; Science and Technology Facilities Council, STFC; Royal Society: 802836, ST/J00412X/1, ST/M005798/1, UF0758946, UF100308; European Research Council, ERC: 268062, 336581; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT; Bundesministerium für Bildung und Forschung, BMBF: 05H12UM5, 05H15UMCNA, 05H18UMCNA; Fonds De La Recherche Scientifique - FNRS, FNRS; Russian Academy of Sciences, РАН; Consejo Nacional de Ciencia y Tecnología, CONACYT; Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR: RBFR12JF2Z; Ministry of Education and Science of the Russian Federation, Minobrnauka; Joint Institute for Nuclear Research, JINR; Instituto Nazionale di Fisica Nucleare, INFN; Russian Science Foundation, RSF: RSF 19-72-10096; Horizon 2020; Ministry of Science and Higher Education of the Russian Federation; Institutul de Fizică Atomică, IFA: 1/16.03.2016, PN 19 06 01 04 Grant
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Research
keywords
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Elementary particles; Branching ratio; Confidence levels; Decay mode; Lepton flavour violations; Lepton-flavor; Lepton-number violation; Lepton-number-violating decay; Orders of magnitude; Upper limits; Atomic physics; article; flavor; lepton
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