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Measurement of the tau-lepton electronic branching fraction
Ammar, Raymond G. Ball, S. Baringer, Philip S. Coppage, Don Copty, N. Davis, Robin E. P. Hancock, N. Kelly, M. Kwak, Nowhan Lam, H.
Ammar, Raymond G.
Ball, S.
Baringer, Philip S.
Coppage, Don
Copty, N.
Davis, Robin E. P.
Hancock, N.
Kelly, M.
Kwak, Nowhan
Lam, H.
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Abstract
The tau lepton electronic branching fraction has been measured with the CLEO II detector at the Cornell Electron Storage Ring as B(e)=0.1749 +/- 0.0014 +/- 0.0022, with the first error statistical and the second systematic. The measurement involves counting electron-positron annihilation events in which both taus decay to electrons, and normalizing to the number of tau-pair decays expected from the measured luminosity. Detected photons in these events constitute a definitive observation of tau decay radiation.
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1992-12
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AMERICAN PHYSICAL SOC
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p3610_1.pdf
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AKERIB, DS, BARISH, B, et al. MEASUREMENT OF THE TAU-LEPTON ELECTRONIC BRANCHING FRACTION. PHYSICAL REVIEW LETTERS. December 1992. 69(25) : 3610-3614