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Improved measurement of B(D+ --> mu+nu) and the pseudoscalar decay constant fD+
Authors:Artuso M  Boulahouache C  Blusk S  Butt J  Dorjkhaidav O  Li J  Menaa N  Mountain R  Nandakumar R  Randrianarivony K  Redjimi R  Sia R  Skwarnicki T  Stone S  Wang J C  Zhang K  Csorna S E  Bonvicini G  Cinabro D  Dubrovin M  Lincoln A  Briere R A  Chen G P  Chen J  Ferguson T  Tatishvili G  Vogel H  Watkins M E  Rosner J L  Adam N E  Alexander J P  Berkelman K  Cassel D G  Crede V  Duboscq J E  Ecklund K M  Ehrlich R  Fields L  Gibbons L  Gittelman B  Gray R  Gray S W  Hartill D L  Heltsley B K  Hertz D  Jones C D  Kandaswamy J  Kreinick D L  Kuznetsov V E  Mahlke-Krüger H  Meyer T O  Onyisi P U E  Patterson J R  Peterson D  Phillips E A
Affiliation:Syracuse University, Syracuse, New York 13244, USA.
Abstract:We extract a relatively precise value for the decay constant of the meson by measuring B(D+ --> mu+nu) = (4.40 +/-0.66(+0.09)(-0.12) x 10(-4) using 281 pb(-1) of data taken on phi(3770) the resonance with the CLEO-c detector. We find fD+ = (222.6 +/- 16.7(+2.8)(-3.4)) MeV, and compare with current theoretical calculations. We also set a 90% confidence upper limit on B(D+e+nu)< 2.4 x 10(-5) which constrains new physics models.
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