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Leptonic decays of the D(s) meson

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>28/02/2002
<mark>Journal</mark>Physics Letters B
Issue number1-2
Number of pages18
Pages (from-to)1-18
<mark>Original language</mark>English


The purely leptonic decays Ds→τν and Ds→μν 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→τν decays with or , and the other optimized for Ds→μν decays. The results are used to evaluate the Ds decay constant, within the Standard Model: fDs=[285±19(stat)±40(syst)] MeV.