Speaker
Description
The Belle and Belle II experiments have collected a $1.6~\mathrm{ab}^{-1}$ sample of $e^+e^-$ collision data at center-of-mass energies near the $\Upsilon(nS)$ resonances. This sample contains approximately 1.3 billion $e^+e^-\to \tau^+\tau^{-}$ events. We use the Belle and Run 1 Belle II data samples to search for lepton-flavor violating decays, presenting searches for the decays $\tau \to \mu\gamma$, $\tau \to \ell\eta$, $\tau\to \ell\pi^0$, and $\tau^-\to \ell^-\alpha$, where $\ell = e$ or $\mu$ and $\alpha$ is an invisible scalar particle. Using the Belle II $600~\mathrm{fb}^{-1}$ data sample we also present new measurements including the $C\!P$ asymmetry in $\tau \to K^0 \pi\nu$ decays, the $\tau$ lifetime, and branching fractions and spectral moments of $\tau$ decays to final states with strangeness.
| Are you an early career researcher? | No |
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