A measurement of the Michel parameters in leptonic decays of the tau
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Issue Date
1997-06Author
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Darling, C.
Davis, Robin E. P.
Hancock, N.
Kotov, S.
Kravchenko, I.
Kwak, Nowhan
Publisher
AMERICAN PHYSICAL SOC
Type
Article
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Show full item recordAbstract
We have measured the spectral shape Michel parameters rho and eta using leptonic decays of the tau, recorded by the CLEO II detector. Assuming e-mu universality in the vectorlike couplings, we find rho(e mu) = 0.735 +/- 0.013 +/- 0.008 and eta(e mu) = -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 mu final states separately.
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Citation
Ammar, R, Baringer, P, et al. A measurement of the Michel parameters in leptonic decays of the tau. PHYSICAL REVIEW LETTERS. June 1997. 78(25) : 4686-4690
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