Measuring cal B(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_D^+

Details Measuring cal B(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_D^+ Measuring cal B(D^+ --> mu^+ nu) and the Pseudoscalar Decay Constant f_D^+

2004-11-15

arxiv.org/abs/hep-ex/0411050v2

Phys.Rev.D70:112004,2004

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2004/, submitted to PRD

Scientific paper

10.1103/PhysRevD.70.112004

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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