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Improved measurement of B(D+ --> mu+nu) and the pseudoscalar decay constant fD+ |
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| 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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