Charged Current Lepton Universality and |Vus| using τ Lepton Decays at BaBar

Using a data sample corresponding to an integrated luminosity of L=467fb−1, collected with the BaBar detector at the SLAC PEP-II e+e− storage ring, we present preliminary measurements of , , , and , where the uncertainties are statistical and systematic, respectively. From the branching ratio , |Vus| is determined to be 0.2255±0.0023. The branching ratio enables a precision test of the Standard Model assumption of charged current lepton universality, . The branching ratios , and provide additional tests of charged current lepton universality, in non-strange and in strange decays.