A measurement of electron-tau universality from decays of intermediate vector bosons at the CERN $$\bar pp$$ collider

European Physical Journal C(1991)

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摘要
The ratio of branching fractions of theW decaying to τ ande leptons is measured using\(\bar pp\) collisions at\(\sqrt s = 630\) GeV. The ratio of the electroweak charged current couplings to theW is then determined to beg τ W /g e W =0.997±0.056 (stat.)±0.042 (syst.). The decay modeZ→τ+→τ+ is observed and also found to be consistent withe-τ universality.
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particle physics
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