Improved measurement of the K+ → π+ νν̄ branching ratio

V. V. Anisimovsky, A. V. Artamonov, B. Bassalleck, B. Bhuyan, E. W. Blackmore, D. A. Bryman, S. Chen, I. H. Chiang, I. A. Christidi, P. S. Cooper, M. V. Diwan, J. S. Frank, T. Fujiwara, J. Hu, A. P. Ivashkin, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. KhotjantsevP. Kitching, M. Kobayashi, T. K. Komatsubara, A. Konaka, A. P. Kozhevnikov, Yu G. Kudenko, A. Kushnirenko, L. G. Landsberg, B. Lewis, K. K. Li, L. S. Littenberg, J. A. Macdonald, J. Mildenberger, O. V. Mineev, M. Miyajima, K. Mizouchi, V. A. Mukhin, N. Muramatsu, T. Nakano, M. Nomachi, T. Nomura, T. Numao, V. F. Obraztsov, K. Omata, D. I. Patalakha, S. V. Petrenko, R. Poutissou, E. J. Ramberg, G. Redlinger, T. Sato, T. Sekiguchi, T. Shinkawa, R. C. Strand, S. Sugimoto, Y. Tamagawa, R. Tschirhart, T. Tsunemi, D. V. Vavilov, B. Viren, N. V. Yershov, Y. Yoshimura, T. Yoshioka

研究成果: Article査読

144 被引用数 (Scopus)

抄録

The upper kinematic limit for K+→π +νν̄ was observed by experiment E949 at Brookhaven National Laboratory. The new procedure enabled to estimates of the expected background and signal rates inside and outside the signal region. Examination of the signal region for the data set yielded one event with P=227.3±2.7 MeV/c, R=39.2±1.2 cm and E=128.9±3.6 MeV. It was suggested that at the measured central value of the branching ratio, the additional event had a signal to background ratio of 0.9.

本文言語English
論文番号031801
ページ(範囲)031801-1-031801-4
ジャーナルPhysical review letters
93
3
DOI
出版ステータスPublished - 2004 7 16
外部発表はい

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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