Anisimovsky, VV; Artamonov, AV; Bassalleck, B; Bhuyan, B; Blackmore, EW; Bryman, DA; Chen, S; ... E949 Collaboration, .; + view all Anisimovsky, VV; Artamonov, AV; Bassalleck, B; Bhuyan, B; Blackmore, EW; Bryman, DA; Chen, S; Chiang, IH; Christidi, IA; Cooper, PS; Diwan, MV; Frank, JS; Fujiwara, T; Hu, J; Ivashkin, AP; Jaffe, DE; Kabe, S; Kettell, SH; Khabibullin, MM; Khotjantsev, AN; Kitching, P; Kobayashi, M; Komatsubara, TK; Konaka, A; Kozhevnikov, AP; Kudenko, YG; Kushnirenko, A; Landsberg, LG; Lewis, B; Li, KK; Littenberg, LS; Macdonald, JA; Mildenberger, J; Mineev, OV; Miyajima, M; Mizouchi, K; Mukhin, VA; Muramatsu, N; Nakano, T; Nomachi, M; Nomura, T; Numao, T; Obraztsov, VF; Omata, K; Patalakha, DI; Petrenko, SV; Poutissou, R; Ramberg, EJ; Redlinger, G; Sato, T; Sekiguchi, T; Shinkawa, T; Strand, RC; Sugimoto, S; Tamagawa, Y; Tschirhart, R; Tsunemi, T; Vavilov, DV; Viren, B; Yershov, NV; Yoshimura, Y; Yoshioka, T; E949 Collaboration, .; - view fewer (2004) Improved measurement of the K+->pi+nu(nu)over-bar branching ratio. PHYS REV LETT , 93 (3) , Article 031801. 10.1103/PhysRevLett.93.031801.

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Abstract

An additional event near the upper kinematic limit for K+-->pi(+)nu(nu) over bar has been observed by experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+-->pi(+)nu(nu) over bar)=(1.47(-0.89)(+1.30))x10(-10) based on three events observed in the pion momentum region 211<P<229 MeV/c. At the measured central value of the branching ratio, the additional event had a signal-to-background ratio of 0.9.

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