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2007

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

CLEO Collaboration, Artuso, M.

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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.

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

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