Improved Measurement of the K + →π + νν̄ Branching Ratio

V. V. Anisimovsky,A. V. Artamonov,B. Bassalleck,B. Bhuyan,Ewart W. Blackmore,Douglas Bryman,Shaomin 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. Khotjantsev,P. Kitching,Masaaki 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,Takashi Nakano,Masaharu Nomachi,T. Nomura,T. Numao,V. Obraztsov,K. Omata,D. I. Patalakha,S. V. Petrenko, R. Poutissou,E. J. Ramberg,George Redlinger,T. Sato,T. Sekiguchi,T. Shinkawa,R. C. Strand, S. Sugimoto,Yoichi Tamagawa,R. Tschirhart,T. Tsunemi,D. V. Vavilov,B. Viren,N. V. Yershov,Y. Yoshimura,Tamaki Yoshioka

Physical Review Letters（2004）

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摘要

An additional event near the upper kinematic limit for K+ to pi+ nu nubar has been observed by Experiment E949 at Brookhaven National Laboratory. Combining previously reported and new data, the branching ratio is B(K+ to pi+ nu nubar)= 1.47 (+1.30, - 0.89) x 10-10 based on three events observed in the pion momentum region 211更多

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