Search for the rare decay $K^{+}\to {\mu }^{+}\nu \bar{\nu }\nu$

Abstract

Evidence of the $K^{+}\to {\mu }^{+}\nu \bar{\nu }\nu$ decay was searched for using E949 experimental data with an exposure of $1.70\times 10^{12}$ stopped kaons. The data sample is dominated by the backgrond process $K^{+}\to {\mu }^{+}{\nu }_{\mu }\gamma$. An upper limit on the decay rate $\Gamma (K^{+}\to {\mu }^{+}\nu \bar{\nu }\nu )<2.4\times 10^{-6}\Gamma (K^{+}\to all)$ at 90% confidence level was set assuming the Standard Model muon spectrum. The data are presented in such a way as to allow calculation of rates for any assumed ${\mu }^{+}$ spectrum.

arXiv comment7 pages, 5 figures

References in corpus (2)

• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Search for heavy neutrinos in $K^{+}\to {\mu }^{+}{\nu }_H$ decays

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• The Forward Physics Facility at the High-Luminosity LHC