1. Search for the rare decay $K^+\to\mu^+\nu\bar\nu\nu$
- Author
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Artamonov, A. V., Bassalleck, B., Bhuyan, B., Blackmore, E. W., Bryman, D. A., Chen, S., Chiang, I-H., Christidi, I. -A., Cooper, P. S., Diwan, M. V., Frank, J. S., Fujiwara, T., Hu, J., Ives, J., Izmaylov, A. O., Jaffe, D. E., Kabe, S., Kettell, S. H., Khabibullin, M. M., Khotjantsev, A. N., Kitching, P., Kobayashi, M., Komatsubara, T. K., Konaka, A., Kudenko, Yu. G., Landsberg, L. G., Lewis, B., Li, K. K., Littenberg, L. S., Macdonald, J. A., Mildenberger, J., Mineev, O. V., Miyajima, M., Mizouchi, K., Muramatsu, N., Nakano, T., Nomachi, M., Nomura, T., Numao, T., Obraztsov, V. F., Omata, K., Patalakha, D. I., Poutissou, R., Redlinger, G., Sato, T., Sekiguchi, T., Shaikhiev, A. T., Shinkawa, T., Strand, R. C., Sugimoto, S., Tamagawa, Y., Tschirhart, R., Tsunemi, T., Vavilov, D. V., Viren, B., Wang, Zhe, Wei, Hanyu, Yershov, N. V., Yoshimura, Y., and Yoshioka, T.
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High Energy Physics - Experiment - 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., Comment: 7 pages, 5 figures
- Published
- 2016
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