2019 Joint Workshop on Future charm-tau Factory

Decays-in-flight muon polarization measurement to extract the Michel parameter ξ′ in tau decays.

24 Sept 2019, 14:00

20m

Beige Hall (Russian Academy of Sciences)

Talk Physics Physics Day

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 ${\xi }^{\prime }$ 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.

Presentation materials

bodrov_ctau19.pdf