We present the first measurement of the Michel parameters η‾ and ξκ in the radiative leptonic decay of the τ lepton using 703 fb-1 of data collected with the Belle detector at the KEKB e+e− collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of e+e−→τ+τ−→(π+π0ν‾)(l−νν‾γ)(l=e or μ). The preliminary values of the measured Michel parameters are η‾=−2.0±1.5±0.8 and ξκ=0.6±0.4±0.2, where the first error is statistical and the second is systematic.
CITATION STYLE
Shimizu, N. (2017). Measurement of the Michel parameters (η‾, ξκ) in the radiative leptonic decay of τ. Nuclear and Particle Physics Proceedings, 287–288, 11–14. https://doi.org/10.1016/j.nuclphysbps.2017.03.034
Mendeley helps you to discover research relevant for your work.