Further evidence for the decay K+ -->pi+nu(nu).
/ Authors
S. Adler, S. Kettell, A. Konaka, J. Macdonald, M. Ito, J. S. Haggerty, C. Witzig, S. Sugimoto, Y. Kuno, L. Littenberg
and 37 more authors
S. Ng, P. Kitching, T. Shinkawa, P. Bergbusch, J. S. Frank, C. Ng, M. Miyajima, T. Shimoyama, V. Jain, Y. Yoshimura, R. Strand, J. R. Stone, Y. Tamagawa, M. Diwan, J. Poutissou, M. Kuriki, A. Bazarko, P. Meyers, J. Hu, Toshihiro Sato, M. Kobayashi, N. Muramatsu, T. Nakano, F. Shoemaker, S. Kabe, K. Li, G. Redlinger, T. Inagaki, T. Numao, K. Shimada, San-Yuan Chen, J. Mildenberger, E. Blackmore, R. Poutissou, D. Bryman, I. Chiang, T. Komatsubara
/ Abstract
Additional evidence for the rare kaon decay K+-->pi+nu(nu) has been found in a new data set with comparable sensitivity to the previously reported result. One new event was observed in the pion momentum region examined, 211<P<229 MeV/c, bringing the total for the combined data set to two. Including all data taken, the backgrounds were estimated to contribute 0.15+/-0.05 events. The branching ratio is B(K+-->pi+nu(nu)) = 1.57(+1.75)(-0.82)x10(-10).
Journal: Physical review letters