Further search for the decay K +→π +νν̄ in the momentum region P<195 MeV/c

S. Adler, M. Aoki, M. Ardebili, M. S. Atiya, A. O. Bazarko, P. C. Bergbusch, B. Bhuyan, E. W. Blackmore, D. A. Bryman, I. H. Chiang, M. R. Convery, M. V. Diwan, J. S. Frank, J. S. Haggerty, T. Inagaki, M. M. Ito, V. Jain, D. E. Jaffe, S. Kabe, M. KazumoriS. H. Kettell, P. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, Y. Kuno, M. Kuriki, T. F. Kycia, K. K. Li, L. S. Littenberg, J. A. Macdonald, R. A. McPherson, P. D. Meyers, J. Mildenberger, N. Muramatsu, T. Nakano, C. Ng, S. Ng, T. Numao, A. Otomo, J. M. Poutissou, R. Poutissou, G. Redlinger, T. Sasaki, T. Sato, T. Shinkawa, F. C. Shoemaker, A. J.S. Smith, R. Soluk, J. R. Stone, R. C. Strand, S. Sugimoto, C. Witzig, Y. Yoshimura

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78 Scopus citations


We report the results of a search for the decay K +→π +νν in the kinematic region with π + momentum 140<P<195 MeV/c using the data collected by the E787 experiment at BNL. No events were observed. When combined with our previous search in this region, one candidate event with an expected background of 1.22±0.24 events results in a 90% C.L. upper limit of 2.2×10 -9 on the branching ratio of K +→π +νν. We also report improved limits on the rates of K +→π +X 0 and K +→π +X 1X 2 where X 0,X 1X 2 are hypothetical, massless, long-lived neutral particles.

Original languageEnglish (US)
Article number037102
Pages (from-to)037102-1-037102-4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
StatePublished - Aug 15 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics


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