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arXiv · 0806.3921

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

Sheldon Stone
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Abstract

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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Sheldon Stone. 2008-06-24. The Purely Leptonic Decays D+ -> mu+ nu and Ds+-> lepton+ nu at CLEO. https://arxiv.org/abs/0806.3921

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