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Measurement of the Michel parameters and the average τ neutrino helicity from τ decays in e + e − → τ + τ −

Measurement of the Michel parameters and the average τ neutrino helicity from τ decays in e + e − → τ + τ −,10.1016/0370-2693(96)00467-4,Physics Lette

Measurement of the Michel parameters and the average τ neutrino helicity from τ decays in e + e − → τ + τ −  
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M. Acciarri, A. Adam, O. Adriani, M. Aguilar-Benitez, S. Ahlen, B. Alpat, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, G. Alverson, M. G. Alviggihttp://academic.research.microsoft.com/io.ashx?type=5&id=18414761&selfId1=0&selfId2=0&maxNumber=12&query=
The Michel parameters ϱ, η, ξ, and ξδ, the chirality parameter ξh and the τ polarization Pτ are measured using 32012 τ pair decays. Their values are extracted from the energy spectra of leptons and hadrons in τ− → l−νlντ and τ− → π−ντ decays, the energy and decay angular distributions in τ− → ϱ−ντ decays, and the correlations in the energy spectra and angular distributions of the decay products.Assuming universality in leptonic and semileptonic τ decays, the results are ϱ = 0.794±0.039±0.031, η = 0.25±0.17±0.11, ξ = 0.94±0.21±0.07, ξδ = 0.81±0.14±0.06, ξh = −0.970±0.053±0.011, and Pτ = −0.154±0.018±0.012. The measurement is in agreement with the V-A hypothesis for the weak charged current.
Journal: Physics Letters B - PHYS LETT B , vol. 377, no. 4, pp. 313-324, 1996
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