Journal
PHYSICS LETTERS B
Volume 807, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135599
Keywords
-
Funding
- F.R.S.-FNRS (Fonds de la Recherche Scientifique -FNRS), Belgium
- BMES (Ministry of Education, Youth and Science), Bulgaria
- NSERC (Natural Sciences and Engineering Research Council) Canada [SAPPJ-2018-0017]
- NRC (National Research Council Canada)
- MEYS (The Ministry of Education, Youth and Sports), Czech Republic
- BMBF (Bundesministerium fur Bildung und Forschung), Germany [05H12UM5, 05H15UMCNA, 05H18UMCNA]
- 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
- IFA (Institute of Atomic Physics) Romanian CERN-RO, Romania [1/16.03.2016]
- IFA (Institute of Atomic Physics) Romanian Nucleus Programme, Romania [PN 19 06 01 04]
- INR-RAS (Institute for Nuclear Research of the Russian Academy of Sciences), Moscow, Russia
- JINR (Joint Institute for Nuclear Research), Dubna, Russia
- NRC (National Research Center) Kurchatov Institute, Russia
- MESRF (Ministry of Education and Science of the Russian Federation), Russia
- MESRS (Ministry of Education, Science, Research and Sport), Slovakia
- CERN (European Organization for Nuclear Research), Switzerland
- STFC (Science and Technology Facilities Council), United Kingdom
- NSF (National Science Foundation), U.S.A. [1506088, 1806430]
- ERC (European Research Council), Europe [268062, 336581]
- Charles University Research Center, Czech Republic [UNCE/SCI/013]
- Ministry of Education, Universities and Research (MIUR Futuro in ricerca 2012), Italy [RBFR12JF2Z]
- Russian Foundation for Basic Research (RFBR), Russia [18-32-00072, 18-32-00245]
- Russian Science Foundation, Russia [RSF 19-72-10096]
- Royal Society, United Kingdom [UF100308, UF0758946]
- STFC (Rutherford fellowships), United Kingdom [ST/J00412X/1, ST/M005798/1]
- ERC [268062, 336581, 802836]
- EU [701386, 842407, 893101]
- STFC [ST/K004042/1, ST/S000860/1, ST/J00412X/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [1806430] Funding Source: National Science Foundation
- Marie Curie Actions (MSCA) [701386, 842407, 893101] Funding Source: Marie Curie Actions (MSCA)
- European Research Council (ERC) [268062, 802836] Funding Source: European Research Council (ERC)
Ask authors/readers for more resources
A search for heavy neutral lepton (N) production in K+ -> e(+)N decays using the data sample collected by the NA62 experiment at CERN in 2017-2018 is reported. Upper limits of the extended neutrino mixing matrix element vertical bar U-e4 vertical bar(2) are established at the level of 10(-9) over most of the accessible heavy neutral lepton mass range 144-462 MeV/c(2), with the assumption that the lifetime exceeds 50 ns. These limits improve significantly upon those of previous production and decay searches. The vertical bar U-e4 vertical bar(2) range favoured by Big Bang Nucleosynthesis is excluded up to a mass of about 340 MeV/c(2). (C) 2020 The Author(s). Published by Elsevier B.V.
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