期刊
PHYSICS LETTERS B
卷 797, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2019.07.041
关键词
-
资金
- funding agencies of the Collaboration Institutes
- BMES (Ministry of Education, Youth and Science), Bulgaria
- NSERC (Natural Sciences and Engineering Research Council), Canada
- NRC (National Research Council Canada) contribution to TRIUMF, Canada
- MEYS (Ministry of Education, Youth and Sports), Czech Republic
- BMBF (Bundesministerium fur Bildung und Forschung) [05H12UM5, 05H15UMCNA]
- INFN (Istituto Nazionale di Fisica Nucleare), Italy
- MIUR (Ministero dell'Istruzione, dell'Universita e della Ricerca), Italy
- CONACyT (Consejo Nacional de Ciencia y Tecnologia), Mexico
- MESRF (Ministry of Education and Science of the Russian Federation), Russia
- MESRS (Ministry of Education, Science, Research and Sport of the Slovak Republic), Slovakia
- NSF (National Sci-ence Foundation) [1506088]
- ERC [268062, 336581, 802836]
- Charles University Research Center, Czech Republic [UNCE/SCI/013]
- Ministry of Education, Universities and Research (MIUR), Italy [RBFR12JF2Z]
- Russian Foundation for Basic Research, Russia [18-32-00072, 18-32-00245]
- Royal Society, United Kingdom [UF100308, UF0758946]
- STFC, United Kingdom [ST/J00412X/1, ST/M005798/1]
- F.R.S.-FNRS (Fonds De La Recherche Scientifique - FNRS), Belgium
- STFC [ST/M005798/1, 2039270, ST/N000404/1, ST/M005798/2, ST/J00412X/1, ST/K004042/1, ST/S000860/1] Funding Source: UKRI
- Royal Society [UF100308, UF0758946] Funding Source: Royal Society
- Division Of Physics
- Direct For Mathematical & Physical Scien [1506088] Funding Source: National Science Foundation
- European Research Council (ERC) [802836, 336581, 268062] Funding Source: European Research Council (ERC)
The NA62 experiment at CERN reports a search for the lepton number violating decays K+ -> pi(-)e(+)e(+) and K+ -> pi(-)mu(+)mu(+) using a data sample collected in 2017. No signals are observed, and upper limits on the branching fractions of these decays of 2.2 x 10(-10) and 4.2 x 10(-11) are obtained, respectively, at 90% confidence level. These upper limits improve on previously reported measurements by factors of 3 and 2, respectively. (C) 2019 The Author. Published by Elsevier B.V.
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