TL;DR
This paper measures the decay rates of Ds mesons into leptons using LEP data, providing a precise estimate of the decay constant within the Standard Model framework.
Contribution
It presents the first combined analysis of Ds leptonic decays from LEP data to determine the decay constant with improved precision.
Findings
Measured branching fractions for Ds -> tau nu and Ds -> mu nu decays.
Estimated the decay constant fDs as 285 ± 19 (stat) ± 40 (syst) MeV.
Validated the Standard Model predictions for leptonic Ds decays.
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
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