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Experimental Study of the Radiative Decays<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>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mi>ν</mml:mi><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><…
Experiment 865 at the Brookhaven Alternating Gradient Synchrotron obtained 410 K+→e+νe+e− and 2679 K+→μ+νe+e− events including 10% and 19% background. The branching ratios were measured to be [2.48±0.14(stat)±0.14(syst)]×10−8 (mee>150 MeV) and (7.06±0.16±0.26)×10−8 (mee>145 MeV), respectively. Results for the decay form factors are presented.Received 5 April 2002DOI:https://doi.org/10.1103/PhysRevLett.89.061803©2002 American Physical Society