Journal
PHYSICS LETTERS B
Volume 816, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2021.136259
Keywords
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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 Canada]
- NRC (National Research Council), Canada
- MEYS (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, 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 grant, Project GAP), 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, United Kingdom [ST/J00412X/1, ST/M005798/1]
- ERC [268062, 336581, 802836]
- EU Horizon 2020 (Marie Sklodowska-Curie grants) [701386, 842407, 893101]
- Direct For Mathematical & Physical Scien
- Division Of Physics [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)
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The NA62 experiment at CERN reports searches for K+ -> mu N+ and K+ -> mu(+)nu X decays, and establishes upper limits for the masses and decay branching fractions of invisible particles N and X using the 2016-2018 data set. An improved upper limit is also established for the branching fraction of K+ -> mu(+)nu nu(nu) over bar.
The NA62 experiment at CERN reports searches for K+ -> mu N+ and K+ -> mu(+)nu X decays, where N and X are massive invisible particles, using the 2016-2018 data set. The N particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of O(10(-8)) of the neutrino mixing parameter vertical bar U-mu 4 vertical bar(2) for N masses in the range 200-384 MeV/c(2) and lifetime exceeding 50 ns. The X particle is considered a scalar or vector hidden sector mediator decaying to an invisible final state, and upper limits of the decay branching fraction for X masses in the range 10-370 MeV/c(2) are reported for the first time, ranging from O(10(-5)) to O(10(-7)). An improved upper limit of 1.0x10(-6) is established at 90% CL on the K+ -> mu(+)nu nu(nu) over bar branching fraction. (C) 2021 The Author(s). Published by Elsevier B.V.
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