HAL : in2p3-00000025, version 1
 Physics Letters B 438 (1998) 405-416
 Measurement of the Michel Parameters and the Average $\tau$-Neutrino Helicity from $\tau$ Decays at LEP
 L3 Collaboration(s)
 (1998)
 Four of the Michel parameters and the average tau-neutrino helicity have been measured by analysing tau decay spectra in 147 \pb ~of data collected by the L3 detector. The decays \tte, ~\ttm, ~\ttp, ~\ttr ~and their charge conjugates were considered. The results: $\rho = 0.762 \pm 0.035$, $\eta = 0.27 \pm 0.14$, $\xi = 0.70 \pm 0.16$, $\xi\delta = 0.70 \pm0.11$ and $\xi_{h} = -1.032 \pm 0.031$ are consistent with a V$-$A structure for the weak charged current and lepton universality.
 équipe(s) de recherche : CMS
 Thème(s) : Physique/Physique des Hautes Energies - Expérience
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 in2p3-00000025, version 1 http://hal.in2p3.fr/in2p3-00000025 oai:hal.in2p3.fr:in2p3-00000025 Contributeur : Sylvie Florès <> Soumis le : Jeudi 5 Novembre 1998, 15:59:23 Dernière modification le : Jeudi 21 Avril 2005, 09:11:29