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Measurement of the very rare K+→π+νν- decay

Cortina Gil, E. and Husek, Tomáš LU (2021) In Journal of High Energy Physics 2021(6).
Abstract
The NA62 experiment reports the branching ratio measurement BR(K+→π+νν¯)=(10.6−3.4+4.0|stat±0.9syst)×10−11 at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+→π+νν¯ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+→ π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80%... (More)
The NA62 experiment reports the branching ratio measurement BR(K+→π+νν¯)=(10.6−3.4+4.0|stat±0.9syst)×10−11 at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+→π+νν¯ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+→ π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample. © 2021, The Author(s). (Less)
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type
Contribution to journal
publication status
published
subject
keywords
FCNC Interaction, Fixed target experiments, Flavor physics, Flavour Changing Neutral Currents, Rare decay
in
Journal of High Energy Physics
volume
2021
issue
6
article number
93
publisher
Springer
external identifiers
  • scopus:85108359113
ISSN
1029-8479
DOI
10.1007/JHEP06(2021)093
language
English
LU publication?
yes
id
265d94cb-eb75-48f3-8983-d1d670e2b0ac
date added to LUP
2021-09-13 14:31:06
date last changed
2024-04-20 12:14:37
@article{265d94cb-eb75-48f3-8983-d1d670e2b0ac,
  abstract     = {{The NA62 experiment reports the branching ratio measurement BR(K+→π+νν¯)=(10.6−3.4+4.0|stat±0.9syst)×10−11 at 68% CL, based on the observation of 20 signal candidates with an expected background of 7.0 events from the total data sample collected at the CERN SPS during 2016–2018. This provides evidence for the very rare K+→π+νν¯ decay, observed with a significance of 3.4σ. The experiment achieves a single event sensitivity of (0.839 ± 0.054) × 10−11, corresponding to 10.0 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. This measurement is also used to set limits on BR(K+→ π+X), where X is a scalar or pseudo-scalar particle. Details are given of the analysis of the 2018 data sample, which corresponds to about 80% of the total data sample. © 2021, The Author(s).}},
  author       = {{Cortina Gil, E. and Husek, Tomáš}},
  issn         = {{1029-8479}},
  keywords     = {{FCNC Interaction; Fixed target experiments; Flavor physics; Flavour Changing Neutral Currents; Rare decay}},
  language     = {{eng}},
  number       = {{6}},
  publisher    = {{Springer}},
  series       = {{Journal of High Energy Physics}},
  title        = {{Measurement of the very rare K<sup>+</sup>→π<sup>+</sup>νν<sup>-</sup> decay}},
  url          = {{http://dx.doi.org/10.1007/JHEP06(2021)093}},
  doi          = {{10.1007/JHEP06(2021)093}},
  volume       = {{2021}},
  year         = {{2021}},
}