The Purely Leptonic Decays D+ -> mu+ nu and Ds+-> lepton+ nu at CLEO

Details The Purely Leptonic Decays D+ -> mu+ nu and Ds+-> lepton+ nu at CLEO The Purely Leptonic Decays D+ -> mu+ nu and Ds+-> lepton+ nu at CLEO

2008-06-24

arxiv.org/abs/0806.3921v1

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 6 figures, to appear in Proceedings of Flavor Physics and CP Violation 2008 (FPCP 2008), and Rencontres de Moriond QC

Scientific paper

We update our previous results by increasing the luminosity, the efficiency, and for the Ds+ the number of tags. We determine f{D+}=(205.8 +/- 8.5 +/- 2.5) MeV, and an interim preliminary value of f{Ds+}=(267.9 +/- 8.2 +/- 3.9) MeV, where both results are radiatively corrected. We agree with the recent most precise unquenched Lattice-QCD calculation for the D+, but are in disagreement for the Ds+. Several consequences are discussed, including the possibility of physics beyond the Standard Model.

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