Autor: |
J. M. Poutissou, S. Ng, P. C. Bergbusch, T. Sasaki, A. J.S. Smith, Y. Yoshimura, R. Poutissou, R. A. McPherson, Takashi Nakano, M. Aoki, J. S. Frank, M. Ardebili, T. Numao, C. Witzig, J. A. Macdonald, L. S. Littenberg, T. Inagaki, Masaaki Kobayashi, Y. Kuno, T. Shinkawa, M. R. Convery, A. Konaka, J. S. Haggerty, M. M. Ito, R. Soluk, J. Mildenberger, F. C. Shoemaker, M. Kuriki, S. Kabe, J. R. Stone, M. V. Diwan, M. Kazumori, T. Sato, A. O. Bazarko, E. W. Blackmore, G. Redlinger, C. Ng, Norihito Muramatsu, K. K. Li, S. Sugimoto, Douglas Bryman, Daniel Robert Marlow, D. E. Jaffe, S. S. Adler, Peter Daniel Meyers, M. S. Atiya, T. F. Kycia, Vivek Jain, P. Kitching, B. Bhuyan, R. C. Strand, I. H. Chiang, S. H. Kettell, T. K. Komatsubara |
Rok vydání: |
2002 |
Předmět: |
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Zdroj: |
Physics Letters B. 537:211-216 |
ISSN: |
0370-2693 |
Popis: |
We have searched for the decay K + →π + ν ν in the kinematic region with pion momentum below the K + → π + π 0 peak. One event was observed, consistent with the background estimate of 0.73±0.18. This implies an upper limit on B(K + →π + ν ν ) −9 (90% C.L.), consistent with the recently measured branching ratio of 1.57 +1.75 −0.82 ×10 −10 , obtained using the standard model spectrum and the kinematic region above the K + → π + π 0 peak. The same data were used to search for K + → π + X 0 , where X 0 is a weakly interacting neutral particle or system of particles with 150 M X 0 c 2 . |
Databáze: |
OpenAIRE |
Externí odkaz: |
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