Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2007-04-04
Phys.Rev.Lett.99:071802,2007
Physics
High Energy Physics
High Energy Physics - Experiment
6 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2007/
Scientific paper
10.1103/PhysRevLett.99.071802
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.
Artuso Marina
CLEO Collaboration
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