New measurement of the K+-->pi+ nunu branching ratio

New measurement of the K+-->pi+ nunu branching ratio

Three events for the decay K+-->pi+ nunu have been observed in the pion momentum region below the K+-->pi+pi0 peak, 140 < Ppi < 199 MeV/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 bra...

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Veröffentlicht in:Physical review letters 2008-11, Vol.101 (19), p.191802-191802
Hauptverfasser: Artamonov, A V, Bassalleck, B, Bhuyan, B, Blackmore, E W, Bryman, D A, Chen, S, Chiang, I-H, Christidi, I-A, Cooper, P S, Diwan, M V, Frank, J S, Fujiwara, T, Hu, J, Ives, J, Jaffe, D E, Kabe, S, Kettell, S H, Khabibullin, M M, Khotjantsev, A N, Kitching, P, Kobayashi, M, Komatsubara, T K, Konaka, A, Kozhevnikov, A P, Kudenko, Yu G, Kushnirenko, A, Landsberg, L G, Lewis, B, Li, K K, Littenberg, L S, Macdonald, J A, Mildenberger, J, Mineev, O V, Miyajima, M, Mizouchi, K, Mukhin, V A, Muramatsu, N, Nakano, T, Nomachi, M, Nomura, T, Numao, T, Obraztsov, V F, Omata, K, Patalakha, D I, Petrenko, S V, Poutissou, R, Ramberg, E J, Redlinger, G, Sato, T, Sekiguchi, T, Shinkawa, T, Strand, R C, Sugimoto, S, Tamagawa, Y, Tschirhart, R, Tsunemi, T, Vavilov, D V, Viren, B, Wang, Zhe, Yershov, N V, Yoshimura, Y, Yoshioka, T
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Sprache:eng
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Zusammenfassung:Three events for the decay K+-->pi+ nunu have been observed in the pion momentum region below the K+-->pi+pi0 peak, 140 < Ppi < 199 MeV/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+-->pi+ nunu) = (1.73(-1.05)+1.15) x 10(-10) consistent with the standard model prediction.
ISSN:0031-9007