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First observation 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>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub><mml:msup><mml:mi>μ</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>
Experiment 865 at the Brookhaven AGS has observed the decay K+→e+νeμ+μ−. The branching ratio extracted is (1.72±0.37(stat)±0.17(syst)±0.19(model))×10−8 where the third term in the error results from the use of a model to extrapolate into a kinematic region dominated by background.Received 12 May 2005DOI:https://doi.org/10.1103/PhysRevD.73.037101©2006 American Physical Society