# Moscow International School of Physics 2022

24 July 2022 to 2 August 2022
House of International Conferences
Europe/Moscow timezone

## A new method for the measurement of the Michel parameters that describe the daughter muon polarization in the $\tau^- \to \mu^- \bar{\nu}_\mu\nu_\tau$ decay

28 Jul 2022, 16:42
12m
House of International Conferences

#### House of International Conferences

Dubna, Russia
Talk (10+2 min) Young Scientist Forum

### Speaker

Denis Bodrov (Higher School of Economics (HSE))

### Description

This work provides a detailed description of the method for the first direct measurement of all Michel parameters in the $\tau^- \to \mu^- \bar{\nu}_\mu\nu_\tau$ decay related to the polarization of the daughter muon. An application of the suggested method in the existing and future experiments at $e^+e^-$ colliders is considered. We have performed a feasibility study for the future Super Charm-Tau Factory and Belle II experiments. For the first one, the sensitivity to the Michel parameters $\xi'$, $\xi''$, $\eta''$, $\alpha'/A$, and $\beta'/A$ is estimated. For the latter, only one Michel parameter, $\xi'$, for which the sensitivity is maximum, is considered.

### Primary author

Denis Bodrov (Higher School of Economics (HSE))

### Presentation Materials

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