Latest Belle results on Tau decays

We present preliminary results of a latest measurement at Belle, the branching fraction of rare tau decay, \tau^- \rightarrow \pi^- \nu_{\tau} \ell^+ \ell^- τ − → π − ν τ ℓ + ℓ − ( \ell = e ℓ = e or \mu μ ), using a 562 \rm fb^{-1}  data set. The branching fraction of \tau^- \rightarrow \pi^- e^+ e^- \nu_\tau τ − → π − e + e − ν τ is measured to be \mathbf{ \mathcal{B}(\tau^-\rightarrow \pi^- e^+ e^- \nu_\tau) = (2.11 \pm 0.19 \pm 0.30) \times 10^{-5}} ℬ ( ???? − → ???? − ???? + ???? − ???? ???? ) = ( 2.11 ± 0.19 ± 0.30 ) × 10 − 5 , where the first uncertainty is statistical and the second is systematic. An upper limit is set on the branching fraction of \tau^- \rightarrow \pi^- \mu^+ \mu^- \nu_\tau τ − → π − μ + μ − ν τ , \mathbf{\mathcal{B}(\tau^-\rightarrow \pi^- \mu^+ \mu^- \nu_\tau) < 1.06 \times 10^{-5}} ℬ ( ???? − → ???? − ???? + ???? − ???? ???? ) < 1.06 × 10 − 5 , at 90% confidence level.