Leptonic decays of the D(s) meson

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

Note:

23 pages, 10 figures Report-no: CERN-EP/2002-001

electron positron: colliding beams
electron positron: annihilation
Z0: electroproduction
Z0: hadronic decay
D/s: leptonic decay
tau: leptonic decay
D/s: decay constant
D/s: hadronic decay
ALEPH
experimental results

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