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

R. Ammar et al. (CLEO Collaboration)
Phys. Rev. Lett. 78, 4686 – Published 23 June 1997
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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 eμ universality in the vectorlike couplings, we find ρeμ=0.735±0.013±0.008 and ηeμ=0.015±0.061±0.062, where the first error is statistical and the second systematic. We also present measurements for the parameters for e and μ final states separately.

  • Received 26 December 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.4686

©1997 American Physical Society

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Vol. 78, Iss. 25 — 23 June 1997

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