Speaker
Description
The COMPASS experiment saw a potential new hadron resonance, the
$\text{a}_1(1420)$, that does not fit into the quark model. Its existence
can be independently verified in the semi-leptonic decay of
$\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$. Also, such a study can reveal a clear
picture on the $\text{a}_1(1260)$ axial vector meson parameters, and test
the presence of the pseudoscalar and spin-exotic contributions. Moreover,
the results of the study can be used later in the measurements of the $\tau$
electric and magnetic dipole moments and $\tau$ Michel parameters. We
present the preliminary results of the $\tau^-\to\pi^-\pi^-\pi^+\nu_\tau$
decay with the Belle detector at the KEKB energy-asymmetric
$\text{e}^+\text{e}^-$ collider using partial-wave analysis technique.
| In-person participation | Yes |
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