25 February 2019 to 1 March 2019
Budker INP
Asia/Novosibirsk timezone

Measurement of Michel parameters in tau decays at high luminosity e+ e- factories

1 Mar 2019, 11:40
20m
Conference room

Conference room

Contributed Oral Tau-lepton physics tau-lepton

Speaker

Denis Epifanov (BINP)

Description

Michel parameters (MP) define the Lorentz structure of the Charged Weak Interaction mediated by W boson in the Standard Model (SM). They are in the list of the basic properties of tau lepton. The difference of the measured MP from their SM expectation will exhibit clear signature of the New Physics. We discuss the key points of the analysis of the huge data sample of taus collected at Belle to measure MP in leptonic tau decays. Essential point of the analysis is to consider the spin-spin correlation of taus, which allows us to extract MP related to tau polarization. At the e+ e- factories with unpolarized beams one have to analyze decay products of both taus to be sensitive to the spin-spin correlation. Nonzero average polarization of single tau at the Super Charm-Tau factory with polarized e- beam provides unique possibility to measure all Michel parameters without tagging the opposite tau.

Primary author

Presentation Materials