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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.
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This is slightly less than 1.71 × 10 12 1.71\times 10^{12} stopped kaons used for the E949 analysis [ 7 ]
Cited in the paper.
A.V. Artamonov et al. (E949 Collaboration), “Study of the decay K + → π + ν ν ¯ {K}^{+}\to\pi^{+}\nu\bar{\nu} in the momentum region 140 < P π < 199 140<{P}_{\pi}<199 MeV/c,” Phys. Rev. D79
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A.V. Artamonov et al. (E949 Collaboration), “Search for heavy neutrinos in K + → μ + ν H {K}^{+}\to\mu^{+}\nu_{H} decays,” Phys. Rev. D91
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