Search for heavy neutrinos in K+→μ+ν decays

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Colleges, School and Institutes


The NA62 experiment recorded a large sample of K+→μ+νμ decays in 2007. A peak search has been performed in the reconstructed missing mass spectrum. In the absence of a signal, limits in the range 2×10−6 to 10−5 have been set on the squared mixing matrix element |Uμ4|2 between muon and heavy neutrino states, for heavy neutrino masses in the range 300–375 MeV/c2. The result extends the range of masses for which upper limits have been set on the value of |Uμ4|2 in previous production search experiments.


Original languageEnglish
Pages (from-to)712–718
JournalPhysics Letters B
Early online date27 Jul 2017
Publication statusPublished - 2017


  • Kaon decays, Heavy neutrinos