Measurement of the Absolute Branching Fractions for $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ and Extraction of the Decay Constant $f_{D_s}$

The BABAR Collaboration, P. del Amo Sanches

The absolute branching fractions for the decays $D_s^{-}\to {\ell }^{-}{\bar{\nu }}_{\ell }$ ($\ell =e$, $\mu$, or $\tau$) are measured using a data sample corresponding to an integrated lum…