Search for K+ decays to a muon and invisible particles

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439674" target="_blank" >RIV/00216208:11320/21:10439674 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3iu3_uu93n" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3iu3_uu93n</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2021.136259" target="_blank" >10.1016/j.physletb.2021.136259</a>

Result language
angličtina
Original language name
Search for K+ decays to a muon and invisible particles
Original language description
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.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/LTT17018" target="_blank" >LTT17018: Getting new knowledge of the microworld using the CERN infrastructure</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN
0370-2693
e-ISSN
—
Volume of the periodical
816
Issue of the periodical within the volume
Neuveden
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
136259
UT code for WoS article
000647421500034
EID of the result in the Scopus database
2-s2.0-85104114266

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