Upper Limit On The Branching Ratio For The Decay Pi 0 -> Vv(-)

Av Artamonov,B Bassalleck, B Bhuyan,Ew Blackmore,Da Bryman, S Chen,Ih Chiang, I-A Christidi, Ps Cooper,Mv Diwan,Js Frank, T Fujiwara,J Hu,De Jaffe, S Kabe,Sh Kettell,Mm Khabibullin,An Khotjantsev, P Kitching,M Kobayashi,Tk Komatsubara, A Konaka, Ap Kozhevnikov,Yg Kudenko, A Kushnirenko,Lg Landsberg, B Lewis,Kk Li,Ls Littenberg,Ja Macdonald, J Mildenberger,Ov Mineev, M Miyajima, K Mizouchi,Va Mukhin, N Muramatsu, T Nakano, M Nomachi, T Nomura, T Numao, Vf Obraztsov, K Omata,Di Patalakha,Sv Petrenko, R Poutissou, Ej Ramberg, G Redlinger, T Sato,T Sekiguchi, T Shinkawa,Rc Strand, S Sugimoto, Y Tamagawa, R Tschirhart, T Tsunemi, Dv Vavilov, B Viren, Nv Yershov, Y Yoshimura,T Yoshioka

PHYSICAL REVIEW D（2005）

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摘要

A sample of kinematically identified K+->pi(+)pi(0) decays obtained with the E949 detector was used to search for the helicity-suppressed decay pi(0)->nu(v) over bar(v) over bar resulting in an upper limit of 2.7x10(-7) at 90% confidence level. The upper limit is also applicable to pi(0) decays into unknown weakly-interacting particles.

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