Using 230.2 fb-1 of e+e- annihilation data collected with the BABAR detector at and near the peak of the Υ(4S) resonance, 489±55 events containing the pure leptonic decay Ds+→μ+νμ have been isolated in charm-tagged events. The ratio of partial widths Γ(Ds+→μ+νμ)/Γ(Ds+→ϕπ+) is measured to be 0.143±0.018±0.006 allowing a determination of the pseudoscalar decay constant fDs=(283±17±7±14) MeV. The errors are statistical, systematic, and from the Ds+→ϕπ+ branching ratio, respectively.
Measurement of the pseudoscalar decay constant f(Ds) using charm-tagged events in e(+)e(-) collisions at root s=10.58.GeV
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2007
Abstract
Using 230.2 fb-1 of e+e- annihilation data collected with the BABAR detector at and near the peak of the Υ(4S) resonance, 489±55 events containing the pure leptonic decay Ds+→μ+νμ have been isolated in charm-tagged events. The ratio of partial widths Γ(Ds+→μ+νμ)/Γ(Ds+→ϕπ+) is measured to be 0.143±0.018±0.006 allowing a determination of the pseudoscalar decay constant fDs=(283±17±7±14) MeV. The errors are statistical, systematic, and from the Ds+→ϕπ+ branching ratio, respectively.File in questo prodotto:
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