Department

Physics

Document Type

Article

Publication Date

6-2017

Embargo Period

7-3-2018

Abstract

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 +π 0ν¯)(l −ννγ¯ ) (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.

Journal

Nuclear and Particle Physics Proceedings

Journal ISSN

2405-6014

Volume

287-288

First Page

11

Last Page

14

Digital Object Identifier (DOI)

10.1016/j.nuclphysbps.2017.03.034

Comments

Preprint.

Included in

Physics Commons

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