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High statistics measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mi>e</mml:mi><mml:mn>4</mml:mn><mml:mn /></mml:mrow></mml:msub></mml:mrow></mml:math>decay properties
We report experimental details and results of a new measurement of the decay K+→π+π−e+νe(Ke4). A sample of more than 400,000Ke4 events with low background has been collected by Experiment 865 at the Brookhaven Alternate Gradient Synchrotron. From these data, the branching ratio (4.11±0.01±0.11)×10−5 and the ππ invariant mass dependence of …