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Measurement of the pseudoscalar decay constant fDs using charm-tagged events in e+e- collisions at square root s=10.58 GeV |
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| Authors: | Aubert B Barate R Bona M Boutigny D Couderc F Karyotakis Y Lees J P Poireau V Tisserand V Zghiche A Grauges E Palano A Pappagallo M Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Ofte I Stugu B Abrams G S Battaglia M Brown D N Button-Shafer J Cahn R N Charles E Day C T Gill M S Groysman Y Jacobsen R G Kadyk J A Kerth L T Kolomensky Yu G Kukartsev G Lynch G Mir L M Oddone P J Orimoto T J Pripstein M Roe N A Ronan M T Wenzel W A Barrett M Ford K E Harrison T J Hart A J Hawkes C M Morgan S E Watson A T Goetzen K Held T Koch H Lewandowski B Pelizaeus M Peters K Schroeder T Steinke M Boyd J T |
| Affiliation: | Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France. |
| 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 Ds+-->micro;+numicro have been isolated in charm-tagged events. The ratio of partial widths Gamma(D+-->micro+numicro)/Gamma(Ds+-->phipi+) 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+-->phipi+ branching ratio, respectively. |
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