Measurement of the K+→π+νν̄ branching ratio

S. Adler, V. V. Anisimovsky, M. Aoki, M. Ardebili, A. V. Artamonov, M. Atiya, B. Bassalleck, A. O. Bazarko, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, M. R. Convery, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. HaggertyJ. Hu, T. Inagaki, M. M. Ito, A. P. Ivashkin, D. E. Jaffe, S. Kabe, M. Kazumori, Y. Kuno, M. Kuriki, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, D. R. Marlow, R. A. McPherson, P. D. Meyers, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, T. Sekiguchi, T. Shinkawa, F. C. Shoemaker, A. J.S. Smith, J. R. Stone, R. C. Strand, S. Sugimoto, Y. Tamagawa, R. Tschirhart, T. Tsunemi, D. V. Vavilov, B. Viren, N. V. Yershov, Y. Yoshimura, T. Yoshioka

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Abstract

Experiment E949 at Brookhaven National Laboratory studied the rare decay K+→π+νν̄ and other processes with an exposure of 1.77×1012 K+'s. The data were analyzed using a blind analysis technique yielding one candidate event with an estimated background of 0.30±0.03 events. Combining this result with the observation of two candidate events by the predecessor experiment E787 gave the branching ratio B(K+→π+νν ̄)=(1.47-0.89+1.30)×10-10, consistent with the standard model prediction of (0.74±0.20)×10-10. This is a more detailed report of results previously published.

Original languageEnglish
Article number052003
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number5
DOIs
Publication statusPublished - 2008 Mar 13

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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    Adler, S., Anisimovsky, V. V., Aoki, M., Ardebili, M., Artamonov, A. V., Atiya, M., Bassalleck, B., Bazarko, A. O., Bhuyan, B., Blackmore, E. W., Bryman, D. A., Chen, S., Chiang, I. H., Christidi, I. A., Convery, M. R., Cooper, P. S., Diwan, M. V., Frank, J. S., Fujiwara, T., ... Yoshioka, T. (2008). Measurement of the K+→π+νν̄ branching ratio. Physical Review D - Particles, Fields, Gravitation and Cosmology, 77(5), [052003]. https://doi.org/10.1103/PhysRevD.77.052003