An investigation of the very rare K+→ π+νν¯ decay

NA62 Collaboration

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19 Citations (Scopus)


The NA62 experiment reports an investigation of the K+→ π+νν¯ mode from a sample of K+ decays collected in 2017 at the CERN SPS. The experiment has achieved a single event sensitivity of (0.389 ± 0.024) × 10−10, corresponding to 2.2 events assuming the Standard Model branching ratio of (8.4 ± 1.0) × 10−11. Two signal candidates are observed with an expected background of 1.5 events. Combined with the result of a similar analysis conducted by NA62 on a smaller data set recorded in 2016, the collaboration now reports an upper limit of 1.78 × 10−10 for the K+→ π+νν¯ branching ratio at 90% CL. This, together with the corresponding 68% CL measurement of (0.48−0.48+0.72) × 10−10, are currently the most precise results worldwide, and are able to constrain some New Physics models that predict large enhancements still allowed by previous measurements.

Original languageEnglish
Article number42
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - Nov 2020

Bibliographical note

Publisher Copyright:
© 2020, The Author(s).

Copyright 2020 Elsevier B.V., All rights reserved.


  • Fixed target experiments
  • Flavor physics
  • Flavour Changing Neutral Currents
  • Rare decay

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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