Search for heavy neutrinos in K%2b → μ%2bνμ decays
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The NA62 experiment recorded a large sample of K%2b→μ%2bνμ 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. © 2017 The Author(s)
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Heavy neutrinos; Kaon decays
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