Measuring cal B(D+ --> mu+ nu) and the Pseudoscalar Decay Constant fD+
Abstract
In 60 inverse-pb of data taken on the psi(3770) resonance with the CLEO-c detector, we find 8 D+ -> mu+ nu decay candidates that are mostly signal, containing only 1 estimated background. Using this statistically compelling sample, we measure a value of B(D+ -> mu+ nu) = (3.5 +/- 1.4 +/- 0.6) x10(-4), and determine fD+=(202 +/- 41 +/-17) MeV.
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