Using 230.2 fb(-1) of e(+)e(-) annihilation data collected with the BABAR detector at and near the peak of the Upsilon(4S) resonance, 489 +/- 55 events containing the pure leptonic decay D(s)(+)->mu(+)nu(mu) have been isolated in charm-tagged events. The ratio of partial widths Gamma(D(s)(+)->mu(+)nu(mu))/Gamma(D(s)(+)->phi pi(+)) is measured to be 0.143 +/- 0.018 +/- 0.006 allowing a determination of the pseudoscalar decay constant f(Ds)=(283 +/- 17 +/- 7 +/- 14) MeV. The errors are statistical, systematic, and from the D(s)(+)->phi pi(+) 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

ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CALDERINI, GIOVANNI;FORTI, FRANCESCO;GIORGI, MARCELLO;PAOLONI, EUGENIO;RIZZO, GIULIANA;
2007-01-01

Abstract

Using 230.2 fb(-1) of e(+)e(-) annihilation data collected with the BABAR detector at and near the peak of the Upsilon(4S) resonance, 489 +/- 55 events containing the pure leptonic decay D(s)(+)->mu(+)nu(mu) have been isolated in charm-tagged events. The ratio of partial widths Gamma(D(s)(+)->mu(+)nu(mu))/Gamma(D(s)(+)->phi pi(+)) is measured to be 0.143 +/- 0.018 +/- 0.006 allowing a determination of the pseudoscalar decay constant f(Ds)=(283 +/- 17 +/- 7 +/- 14) MeV. The errors are statistical, systematic, and from the D(s)(+)->phi pi(+) branching ratio, respectively.
2007
Aubert, B; Barate, R; Bona, M; Boutigny, D; Couderc, F; Karyotakis, Y; Lees, Jp; Poireau, V; Tisserand, V; Zghiche, A; Grauges, E; Palano, A; Pappagal...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/183048
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