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An additional event near the upper kinematic limit for K+ to pi+ nu nubar hasbeen observed by Experiment E949 at Brookhaven National Laboratory. Combiningpreviously 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 pionmomentum region 211<P<229 MeV/c. At the measured central value of the branchingratio, the additional event had a signal-to-background ratio of 0.9

physical review letters

Improved Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:mover accent="true"><mml:mi>ν</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>Branching Ratio

Improved Measurement of theK+→π+νν¯Branching Ratio