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arXiv · 0704.0629

Measurement of the Decay Constant $f_D{_S^+}$ using $D_S^+ --> ell^+ nu

CLEO Collaboration·M. Artuso
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Abstract

We measure the decay constant fDs using the Ds -> l+ nu channel, where the l+ designates either a mu+ or a tau+, when the tau+ -> pi+ nu. Using both measurements we find fDs = 274 +-13 +- 7 MeV. Combining with our previous determination of fD+, we compute the ratio fDs/fD+ = 1.23 +- 0.11 +- 0.04. We compare with theoretical estimates.

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CLEO Collaboration, M. Artuso. 2007-08-17. Measurement of the Decay Constant $f_D{_S^+}$ using $D_S^+ --> ell^+ nu. https://doi.org/10.1103/physrevlett.99.071802

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