# Measurement of the Pseudoscalar Decay Constant fDs Using Charm-Tagged Events in $e^+e^-$ Collisions at $\sqrt{s}=10.58GeV$

Abstract : Using 230.2 fb^(-1) of e+e- annihilation data collected with the BABAR detector at and near the peak of the Y(4S) resonance, 489 +/- 55 events containing the pure leptonic decay D_s^+ --> mu^+ nu_mu have been isolated in charm-tagged events. The ratio of partial widths Gamma(D_s^+ --> mu^+ nu_mu)/Gamma(D_s^+ --> phi pi^+) is measured to be 0.143 +/- 0.018 +/- 0.006 allowing a determination of the pseudoscalar decay constant f_{D_s} = (283 +/- 17 +/- 7 +/- 14) MeV. The errors are statistical, systematic, and from the D_s^+ --> phi pi^+ branching ratio, respectively.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00113860
Contributor : Claudine Bombar <>
Submitted on : Tuesday, November 14, 2006 - 5:49:08 PM
Last modification on : Sunday, June 20, 2021 - 3:35:01 AM

### Citation

B. Aubert, R. Barate, M. Bona, D. Boutigny, F. Couderc, et al.. Measurement of the Pseudoscalar Decay Constant fDs Using Charm-Tagged Events in $e^+e^-$ Collisions at $\sqrt{s}=10.58GeV$. Physical Review Letters, American Physical Society, 2007, 98, pp.141801. ⟨10.1103/PhysRevLett.98.141801⟩. ⟨in2p3-00113860⟩

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