abstract

• The first search for the lepton number violating decay K →π0π−μ e and lepton flavour violating decays K →π0π μ−e , K →π0π μ e− has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of 2.9×10−10, 3.1×10−10 and 5.0×10−10, respectively, are obtained at 90%25 CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions.

authors

• Engelfried Jatzkowski Jurgen
• Engelfried Jatzkowski Jurgen
• The NA62 Collaboration
• The NA62 Collaboration

publication date

• 2024-01-01

funding provided via

• Instituto Nazionale di Fisica Nucleare, INFN; Consejo Nacional de Humanidades, Ciencias y Tecnologías, Conahcyt; Czech Republic; CECI; Collaboration Institutes; Enseignement Supérieur et de la Recherche Scientifique, MESRS; Ministry of Education, Science, Research and Sport; Ministerstvo školstva, vedy, výskumu a športu Slovenskej republiky; CERN; Horizon 2020; Natural Sciences and Engineering Research Council of Canada, NSERC, (SAPPJ-2018-0017); Natural Sciences and Engineering Research Council of Canada, NSERC; Grantová Agentura České Republiky, GAČR, (23-06770S); Grantová Agentura České Republiky, GAČR; Fonds De La Recherche Scientifique - FNRS, FNRS, (2.5020.11, 4.4512.10); Fonds De La Recherche Scientifique - FNRS, FNRS; Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT, (LM 2018104); Ministerstvo Školství, Mládeže a Tělovýchovy, MŠMT; Science and Technology Facilities Council, STFC, (ST/M005798/1, ST/J00412X/1); Science and Technology Facilities Council, STFC; Royal Society, (UF100308, UF0758946); Royal Society; Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR, (RBFR12JF2Z); Ministero dell’Istruzione, dell’Università e della Ricerca, MIUR; Institutul de Fizică Atomică, IFA, (1/16.03.2016, PN 19 06 01 04); Institutul de Fizică Atomică, IFA; National Science Foundation, NSF, (1506088, 1806430); National Science Foundation, NSF; European Research Council, ERC, (802836, 336581, 268062); European Research Council, ERC; Univerzita Karlova v Praze, UK, (PRIMUS 23/SCI/025, UNCE/SCI/013); Univerzita Karlova v Praze, UK; Bundesministerium für Bildung und Forschung, BMBF, (05H18UMCNA, 05H15UMCNA, 05H12UM5); Bundesministerium für Bildung und Forschung, BMBF; H2020 Marie Skłodowska-Curie Actions, MSCA, (701386, 101023808, 893101, 754496, 842407); H2020 Marie Skłodowska-Curie Actions, MSCA  Grant

published in

• Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics  Journal

keywords

Digital Object Identifier (DOI)

• 10.1016/j.physletb.2024.139122

PubMed ID

start page

end page

volume

• 859

issue