Using 230.2fb-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+→ π+) 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+→ π+ branching ratio, respectively.

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2007). Measurement of the pseudoscalar decay constant fDs using charm-tagged events in e+e- collisions at s=10.58GeV. PHYSICAL REVIEW LETTERS, 98(14) [10.1103/PhysRevLett.98.141801].

Measurement of the pseudoscalar decay constant fDs using charm-tagged events in e+e- collisions at s=10.58GeV

CARPINELLI, Massimo;
2007

Abstract

Using 230.2fb-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+→ π+) 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+→ π+ branching ratio, respectively.
Articolo in rivista - Articolo scientifico
Gamma rays; Particle detectors; Resonance; Annihilation; Decay constant; Plasma collision processes;
English
B. Aubert et al. (BABAR Collaboration)
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2007). Measurement of the pseudoscalar decay constant fDs using charm-tagged events in e+e- collisions at s=10.58GeV. PHYSICAL REVIEW LETTERS, 98(14) [10.1103/PhysRevLett.98.141801].
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