Measurement of the K+→π0μ+νμγ branching ratio

S. Adler, A. O. Bazarko, P. C. Bergbusch, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, M. V. Diwan, J. S. Frank, T. Fujiwara, J. S. Haggerty, J. Hu, T. Inagaki, M. M. Ito, D. E. Jaffe, V. Jain, S. Kabe, S. H. Kettell, P. Kitching, M. KobayashiT. K. Komatsubara, A. Konaka, Y. Kuno, M. Kuriki, K. K. Li, L. S. Littenberg, J. A. MacDonald, P. D. Meyers, J. Mildenberger, M. Miyajima, N. Muramatsu, T. Nakano, C. Ng, S. Ng, T. Nomura, T. Numao, J. M. Poutissou, R. Poutissou, G. Redlinger, T. Sato, K. Shimada, T. Shimoyama, T. Shinkawa, F. C. Shoemaker, J. R. Stone, R. C. Strand, S. Sugimoto, Y. Tamagawa, T. Tsunemi, C. Witzig, Y. Yoshimura

Research output: Contribution to journalArticle

2 Citations (Scopus)


A measurement of the decay K+→π0μ+νμ γ has been performed with the E787 detector at Brookhaven National Laboratory. Forty events were observed in the signal region with the background expectation of (16.5±2.7) events. The branching ratio was measured to be (1.58±0.46(stat.)±0.08(syst.))×10-5 in the kinematic region Eγ>30MeV and θμγ>20°, where Eγ is the energy of the emitted photon and θμγ is the angle between the muon and the photon in the K+ rest frame. The results were consistent with theoretical predictions.

Original languageEnglish
Article number092001
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
Publication statusPublished - 2010 May 3
Externally publishedYes

ASJC Scopus subject areas

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

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    Adler, S., Bazarko, A. O., Bergbusch, P. C., Blackmore, E. W., Bryman, D. A., Chen, S., Chiang, I. H., Diwan, M. V., Frank, J. S., Fujiwara, T., Haggerty, J. S., Hu, J., Inagaki, T., Ito, M. M., Jaffe, D. E., Jain, V., Kabe, S., Kettell, S. H., Kitching, P., ... Yoshimura, Y. (2010). Measurement of the K+→π0μ+νμγ branching ratio. Physical Review D - Particles, Fields, Gravitation and Cosmology, 81(9), [092001].