Events with Large Missing Transverse Energy at the CERN Collider: W ---> tau-neutrino Decay and Test of tau - mu e Universality at Q**2 = m(w**2)
Authors (1 total): J. Rohlf
We report results based on a sample of events with large missing transverse energy corresponding to 715 nb−n of data from the UA1 experiment at the CERN proton-antiproton collider. High transverse-momentum tau-leptons from W decays are observed for the first time through their semi-hadronic decay modes and associated missing transverse energy. The measured relative rates of W→eν, W→μν, and W→τν provide the first direct tests of the electron-muon-tau universality of the weak charged couplings at Q2=mw2. We determine gτ/ge=1.01±0.09±0.05 and gμ/ge=1.05±0.07±0.08.