Measurement of Michel parameters in leptonic τ decays at Belle

The BELLE collaboration

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2 Citations (Scopus)


We present a study of Michel parameters in leptonic τ decays using experimental information collected at the Belle detector. Michel parameters are extracted in the unbinned maximum likelihood fit of the (τ→ℓνν τ±→π±π0ν) (ℓ=e, μ) events in the full nine-dimensional phase space. We exploit the spin-spin correlation of tau leptons to extract ξρξ and ξρξδ in addition to the ρ and η parameters. Sensitivity of the method and systematic effects will be discussed.

Original languageEnglish
Pages (from-to)7-10
Number of pages4
JournalNuclear and Particle Physics Proceedings
Publication statusPublished - 1 Jun 2017
Event14th International Workshop on Tau Lepton Physics (Tau) - Beijing
Duration: 19 Sep 201623 Sep 2016


  • charged weak interaction
  • Michel parameter
  • tau lepton
  • PAIR


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