# 2019 Joint Workshop on Future charm-tau Factory

24-28 September 2019
Russian Academy of Sciences
Europe/Moscow timezone

## Decays-in-flight muon polarization measurement to extract the Michel parameter $\xi'$ in tau decays.

24 Sep 2019, 14:00
20m
Beige Hall (Russian Academy of Sciences)

### Beige Hall

#### Russian Academy of Sciences

Leninsky Prospekt, 32а Moscow 119071 Russian Federation
Talk Physics

### Speaker

Denis Bodrov (Moscow Institute of Physics and Technology (MIPT))

### Description

We present a feasibility study of muon polarization measurement to extract the Michel parameter $\xi’$ in tau decays. We suggest as method using the angular distribution of electron in the rest frame of decayed in the drift chamber muon, as electron momentum correlates with muon polarization. The Monte Carlo simulation of Belle detector with parameters of SCT beams was used to generate signal events. The possible background was studied and methods of its suppression were suggested. The most contribution is expected from the light mesons decayed in flight and from particles scattering. The reconstruction efficiency and statistical uncertainties were estimated depend on muon polarization.

### Primary author

Denis Bodrov (Moscow Institute of Physics and Technology (MIPT))

### Presentation Materials

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