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Study of the decay<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>in the momentum region<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>140</mml:mn><mml:mo><</mml:mo><mml:msub><mml:mi>P</mml:mi><mml:mi>…
Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+→π+ν¯ν in the pion momentum region 140<Pπ<199 MeV/c in an exposure of 1.71×1012 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+→π+ν¯ν events to seven. Combining …