# Leptonic decays of the $D_s$ meson

Abstract : The purely leptonic decays Ds -> tau nu and Ds -> mu nu are studied in a sample of four million hadronic Z decays collected with the ALEPH detector at the LEP e+e- collider from 1991 to 1995. The branching fractions are extracted from a combination of two analyses, one optimized to select Ds -> tau nu decays with tau -> e nu nubar or mu nu nubar, and the other optimized for Ds-> mu nu decays. The results are used to evaluate the Ds decay constant, within the Standard Model: fDs = [285 +- 19(stat) +- 40 (syst)] MeV.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011150
Contributor : Claudine Bombar <>
Submitted on : Thursday, March 28, 2002 - 11:26:30 AM
Last modification on : Monday, March 29, 2021 - 3:22:09 PM

### Citation

A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Leptonic decays of the $D_s$ meson. Physics Letters B, Elsevier, 2002, 528, pp.1-18. ⟨in2p3-00011150⟩

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