Measurement of the tau-lepton electronic branching fraction
Ammar, Raymond G.
Baringer, Philip S.
Davis, Robin E. P.
AMERICAN PHYSICAL SOC
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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.
AKERIB, DS, BARISH, B, et al. MEASUREMENT OF THE TAU-LEPTON ELECTRONIC BRANCHING FRACTION. PHYSICAL REVIEW LETTERS. December 1992. 69(25) : 3610-3614
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