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

A. V. Artamonov; B. Bassalleck; B. Bhuyan; E. W. Blackmore; D. A. Bryman; S. Chen; I-H. Chiang; I. -A. Christidi; P. S. Cooper; M. V. Diwan; J. S. Frank; T. Fujiwara; J. Hu; J. Ives; A. O. Izmaylov; D. E. Jaffe; S. Kabe; S. H. Kettell; M. M. Khabibullin; A. N. Khotjantsev; P. Kitching; M. Kobayashi; T. K. Komatsubara; A. Konaka; Yu. G. Kudenko; L. G. Landsberg; B. Lewis; K. K. Li; L. S. Littenberg; J. A. Macdonald; J. Mildenberger; O. V. Mineev; M. Miyajima; K. Mizouchi; N. Muramatsu; T. Nakano; M. Nomachi; T. Nomura; T. Numao; V. F. Obraztsov; K. Omata; D. I. Patalakha; R. Poutissou; G. Redlinger; T. Sato; T. Sekiguchi; A. T. Shaikhiev; T. Shinkawa; R. C. Strand; S. Sugimoto; Y. Tamagawa; R. Tschirhart; T. Tsunemi; D. V. Vavilov; B. Viren; Zhe Wang; Hanyu Wei; N. V. Yershov; Y. Yoshimura; T. Yoshioka

doi:10.1103/physrevd.94.032012

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arXiv · 1606.09054

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

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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.

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A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I-H. Chiang, I. -A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, J. Ives, A. O. Izmaylov, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, Yu. G. Kudenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, R. Poutissou, G. Redlinger, T. Sato, T. Sekiguchi, A. T. Shaikhiev, T. Shinkawa, R. C. Strand, S. Sugimoto, Y. Tamagawa, R. Tschirhart, T. Tsunemi, D. V. Vavilov, B. Viren, Zhe Wang, Hanyu Wei, N. V. Yershov, Y. Yoshimura, T. Yoshioka. 2016-06-29. Search for the rare decay $K^+\to\mu^+\nu\bar\nu\nu$. https://doi.org/10.1103/physrevd.94.032012

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