Abstract
I present the measurements and limits of the branching fractions of leptonic decays of the Ds meson, and the subsequent estimation of the decay constant fDs, using the complete BaBar dataset (530 fb-1). we measure [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], and fDs = (258.6±6.4±7.5)MeV, where the first uncertainties are statistical and the second uncertainties are systematic.
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