%0 Journal Article
%T Leptonic decays of the Ds meson
%A ALEPH Collaboration
%J Statistics
%D 2002
%I arXiv
%R 10.1016/S0370-2693(02)01212-1
%X 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
%U http://arxiv.org/abs/hep-ex/0201024v1