2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204531A first measurement of the average polarisation P_tau 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 P_tau = -0.164 +/- 0.125 is consistent with the Standard Model prediction for the mean LEP energy of 197 GeV.17 pages, 5 figures, Accepted by Phys. Lett. BHigh Energy Physics - Experimenttext