A Measurement of the Michel Parameters in Leptonic Decays of the Tau

CLEO Collaboration

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We have measured the spectral shape Michel parameters ρ and η using leptonic decays of the τ, recorded by the CLEO II detector. Assuming e - μ universality in the vectorlike couplings, we find ρ = 0.735 ± 0.013 ± 0.008, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.

Original languageEnglish
Pages (from-to)4686-4690
Number of pages5
JournalPhysical review letters
Issue number25
Publication statusPublished - 1997 Jun 23

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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