| Abstract |
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The branching fraction for the decay Ds->tau nu,
with tau -> e+ nue nutau,
is measured using a data sample corresponding to an integrated luminosity of 427 fb-1
collected at center of mass energies near 10.58 GeV with the
BaBar detector at the
PEP-II asymmetric-energy e+ e- collider at SLAC.
In the process e+ e- -> c cbar -> D*s DTag K X,
the D*s meson is reconstructed as a missing particle, and the subsequent decay
D*s -> Ds gamma yields an inclusive Ds data sample. Here DTag
refers to a fully reconstructed hadronic D decay, K
is a K- or K0,
and X stands for any number of charged or neutral pions. The decay Ds -> K0S K+
is isolated also, and from ratio of event yields and known branching fractions,
BR(Ds -> tau nutau) = (4.5+-0.5+-0.4+-0.3)% is determined.
The pseudoscalar decay constant
is extracted to be fDs = (233+-13+-10+-7) MeV, where the first uncertainty
is statistical, the second is systematic, and the third results from the uncertainties on
the external measurements used as input to the calculation.
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