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Measuring<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="script">B</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>D</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:mo stretchy="false">)</mml:mo></mml:math>and the pseudoscalar decay constant<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>f</mml:mi><mml:msup…
In 60 pb−1 of data taken on the ψ(3770) resonance with the CLEO-c detector, we find eight D+→μ+ν decay candidates that are mostly signal, containing only one estimated background. Using this statistically compelling sample, we measure a value of B(D+→μ+ν)=(3.5±1.4±0.6)×10−4, and determine fD+=(202±41±17) MeV.4 MoreReceived 11 November 2004DOI:https://doi.org/10.1103/PhysRevD.70.112004©2004 American Physical …