- A first measurement of the average polarisation Pτ 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 Pτ = - 0.164 ± 0.125 is consistent with the Standard Model prediction for the mean LEP energy of 197 GeV. © 2007 Elsevier B.V. All rights reserved.
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Measurement of the tau lepton polarisation at LEP2
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