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arxiv: 0903.0030 · v1 · submitted 2009-02-28 · ✦ hep-ex

Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c

E949 Collaboration: A.V. Artamonov , B. Bassalleck , B. Bhuyan , E.W. Blackmore , D.A. Bryman , S. Chen , I-H. Chiang , I.-A. Christidi
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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. 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 Zhe Wang N.V. Yershov Y. Yoshimura T. Yoshioka
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classification ✦ hep-ex
keywords decayeventsnubarresultsmomentumobservedpionregion
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Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ => pi+,nu,nubar in the pion momentum region 140 < P_pi < 199 MeV/c in an exposure of 1.71e12 stopped kaons with an estimated total background of 0.93+-0.17(stat.)+0.32-0.24(syst.) events. This brings the total number of observed K+ => pi+,nu,nubar events to seven. Combining this observation with previous results, assuming the pion spectrum predicted by the standard model, results in a branching ratio of (1.73+1.15-1.05)e-10. An interpretation of the results for alternative models of the decay K^ => pi+,nothing is also presented.

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