Improved Measurement of the K+ to pi+ nu nubar Branching Ratio

Details Improved Measurement of the K+ to pi+ nu nubar Branching Ratio Improved Measurement of the K+ to pi+ nu nubar Branching Ratio

2004-03-23

arxiv.org/abs/hep-ex/0403036v4

Phys.Rev.Lett.93:031801,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevLett.93.031801

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

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