Title

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

Document Type

Article

Publication Date

6-23-1997

Abstract

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. © 1997 The American Physical Society. eμ

Publication Name

Physical Review Letters

Volume Number

78

First Page

4686

Last Page

4690

Issue Number

25

DOI

10.1103/PhysRevLett.78.4686

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