A STUDY OF THE LORENTZ STRUCTURE IN τ DECAYS IN DELPHI
G. Gomez Ceballos · International Journal of Modern Physics A · 2001
A measurement of the Michel parameters, η, ρ, ξ, ξδ, and the average ντ helicity, hντ, in τ lepton decays is described together with the first measurement of the tensor coupling in the weak charged current. The results are consistent with the V - A structure of the weak charged current in decays of the τ lepton.