Measurement of the tau neutrino helicity and Michel parameters in polarized e(+)e(-) collisions

Authors

The SLD Collaboration

Publication Date

1997

Journal or Book Title

Physical Review Letters

Abstract

We present a new measurement of the τ neutrino helicity hντ and the τ Michel parameters ρ, η, ξ, and the product δξ. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the τ decay spectra, using the 1993–1995 SLD data sample of 4328 e+e−→Z0→τ+τ− events. From the decays τ→πντ and τ→ρντ we obtain a combined value hντ=−0.93±0.10±0.04. The leptonic decay channels yield combined values of ρ=0.72±0.09±0.03, ξ=1.05±0.35±0.04, and δξ=0.88±0.27±0.04.

DOI

https://doi.org/10.1103/PhysRevLett.78.4691

Pages

4691-4696

Volume

78

Issue

25

Recommended Citation

The SLD Collaboration, "Measurement of the tau neutrino helicity and Michel parameters in polarized e(+)e(-) collisions" (1997). Physical Review Letters. 500.
https://doi.org/10.1103/PhysRevLett.78.4691