Recent Results on $\tau$ Decays

Abstract

We present herein new results from Belle on the $\tau^- \rightarrow \pi^- \nu_{\rm \tau} \ell^+ \ell^- $ branching fraction and from BABAR on the $\tau^- \rightarrow K^- (0,1,2,3) \pi^0 \nu_{\rm \tau}$, $\tau^- \rightarrow \pi^- (3,4) \pi^0 \nu_{\rm \tau}$ and $\tau^- \rightarrow K^- K^0_{\rm S} \nu_{\rm \tau}$ branching fractions. From the $K^- K^0_{\rm S}$ mass spectrum we determine the spectral function. The improved branching fraction measurements of the $\tau^- \rightarrow K^- (0,1,2,3) \pi^0 \nu_{\rm \tau}$ decays are used to determine $|V_{\rm us}|$ from $\tau^- \rightarrow X_{\rm s}^- \nu_{\rm \tau}$ inclusive decays.