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Measurement of 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:msub><mml:mi>D</mml:mi><mml:mi>s</mml:mi></mml:msub></mml:msub></mml:math>Using Charm-Tagged Events in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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>Collisions at<mml:math xmlns:mml="http://www.…
Using 230.2 fb−1 of e+e− annihilation data collected with the BABAR detector at and near the peak of the Υ(4S) resonance, 489±55 events containing the pure leptonic decay D+s→μ+νμ have been isolated in charm-tagged events. The ratio of partial widths Γ(D+s→μ+νμ)/Γ(D+s→ϕπ+) is measured to be 0.143±0.018±0.006 allowing a determination of …