Speaker
Jing-Ge Shiu
(National Taiwan University (TW))
Description
The Belle and Belle~II experiments have collected a
$1.4~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at
centre-of-mass energies near the $\Upsilon(nS)$ resonances. This sample
contains approximately 1.3 billion $e^+e^-\to \tau^+\tau^{-}$ events,
which we use to search for lepton-flavour violating decays. We present
searches for $\tau-\to \mu^-\mu^-\mu^+$, $\tau^-\to\Lambda\pi^-$, and
$\tau^-\to \bar{\Lambda}\pi^-$. We also present world leading
measurements of the $\tau$ mass and lepton-flavour universality in
$\tau\to\ell\nu\bar{\nu}$ decay, where $\ell$ is an electron or a muon.
Authors
Belle-II Collaboration
Jing-Ge Shiu
(National Taiwan University (TW))
Paul Jackson
(University of Adelaide)
