Search for the decay K→πν in the momentum region P<195 MeV/c

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:	Momentum Physics Nuclear and High Energy Physics Pion Branching fraction Atomic physics Neutral particle Event (particle physics) Standard Model
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:	https://explore.openaire.eu/search/publication?articleId=doi_________::5fb179d84bf83fce402f1a6f36f38cfa https://doi.org/10.1016/s0370-2693(02)01911-1 Zobrazit plný text záznamu Full Text from ScienceDirect