Speaker
Kiyoshi Hayasaka
Description
We evaluate the Michel parameters of $\tau$ decays using the full data
sample of Belle. This is important to reveal the Lorentz structure of
$\tau$ leptonic decays, which includes not only the V − A interaction but
also contributions from scalar, tensor and others that may arise from
New Physics, thus testing lepton universality as well. We use both
$\tau^+ \to l^+ \nu \bar{\nu}$ and $\tau^+ \to l^+ \gamma \nu
\bar{\nu}$. We also measure branching fractions of $\tau$ decays into
three charged leptons and two neutrinos. From this, we can constrain
Michelle-like parameters.
| Experimental Collaboration | Belle |
|---|
Primary authors
Kiyoshi Hayasaka
Youngjoon Kwon
(Yonsei University)
