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A measurement of the Michel parameters in leptonic decays of the tau
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.
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.
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Abstract
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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1997-06
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AMERICAN PHYSICAL SOC
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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