Studies of τ−→h−h−h+ν and τ−→K−π0ν Decays at BaBar

We present preliminary inclusive branching fraction measurements of and τ−→K−π0ν decay modes using a sample of τ-pair events collected by the BaBar detector at the SLAC PEP-II asymmetric e+e− storage ring. The branching fractions of τ−→π−π−π+ν, τ−→K−π−π+ν and τ−→K−π−K+ν are measured with higher precision than previously published results and the inclusive branching fraction τ−→K−K−K+ν is measured for the first time. In addition, the first measurement of the branching fraction τ−→π−ϕν and the measurement of the branching fraction τ−→K−ϕν are determined by means of a binned maximum likelihood fit to the K+K− invariant mass distribution. These branching fractions are extracted by means of a migration matrix that accounts for the cross contamination between the τ→h−h−h+ν modes. The preliminary τ−→K−π0ν branching fraction and invariant mass distributions are also presented in this paper.