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

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, J. Ives, D. E. Jaffe, S. Kabe, S. H. Kettell, M. M. Khabibullin, A. N. Khotjantsev, P. KitchingM. 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, Zhe Wang, N. V. Yershov, Y. Yoshimura, T. Yoshioka

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233 Citations (Scopus)

Abstract

Three events for the decay K+→π+νν̄ have been observed in the pion momentum region below the K+→π+π0 peak, 140<Pπ<199MeV/c, with an estimated background of 0.93±0.17(stat. )-0.24+0.32(syst.) events. Combining this observation with previously reported results yields a branching ratio of B(K+→π+νν̄)=(1.73-1.05+1. 15)×10-10 consistent with the standard model prediction.

Original languageEnglish
Article number191802
JournalPhysical review letters
Volume101
Issue number19
DOIs
Publication statusPublished - Nov 7 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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