Measurement of the Tau Lepton Polarisation at LEP2
Abstract
A first measurement of the average polarisation Ptau of tau leptons produced in e+e- annihilation at energies significantly above the Z resonance is presented. The polarisation is determined from the kinematic spectra of tau hadronic decays. The measured value Ptau = -0.164 +/- 0.125 is consistent with the Standard Model prediction for the mean LEP energy of 197 GeV.
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