Correlation measurements in Z→τ+τ− and the τ neutrino helicity
1994
Using data collected with the
ALEPHdetector at LEP correlations between the
decay productsof the τ+ and τ− produced in the decay of the Z have been measured. The measurements performed in the decays τ→πν and τ→ϱν place limits on deviations from the
Standard Model. These are given by the parameter ζ with ζ = −1 for the
Standard Model. The measured values are ζπ = −0.95 ± 0.11 ± 0.05 and ζϱ = −1.03 ± 0.11 ± 0.05. For models which predict ζπ = ζϱ = ζ — interpreted as the average τ neutrino helicity — the measurement is ζ = −0.99 ± 0.07 ± 0.04.
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