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Phys. Rev. Lett. 98, 141801 (2007) [7 pages]

Measurement of the Pseudoscalar Decay Constant fDs Using Charm-Tagged Events in e+e- Collisions at s=10.58  GeV

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B. Aubert et al. BABAR Collaboration
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Received 1 August 2006; published 5 April 2007

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 Ds+μ+νμ have been isolated in charm-tagged events. The ratio of partial widths Γ(Ds+μ+νμ)/Γ(Ds+ϕπ+) is measured to be 0.143±0.018±0.006 allowing a determination of the pseudoscalar decay constant fDs=(283±17±7±14)  MeV. The errors are statistical, systematic, and from the Ds+ϕπ+ branching ratio, respectively.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.141801
DOI:
10.1103/PhysRevLett.98.141801
PACS:
13.20.Fc, 14.40.Lb