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
2007
98
14
141801
none
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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389660
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