Speaker
Yifan Jin
(The University of Tokyo)
Description
We firstly measure the branching fraction for tau -> pi e+e- nu and pi
mu+mu- nu. Though these decays are allowed by the standard model, they
have never been measured because they are expected to have a small
branching fraction. Belle's largest tau data sample makes us to expect
to measure these decays with a high sensitivity. In this presentation,
we show the result of measurement of branching fraction of these decays
using Belle's full data sample. We also discuss the result with the
hadron physics model prediction, which has been published recently.
