Michel parameters and τ neutrino helicity from decay correlations in Z → τ+τ−

Buskulic, D. and Finch, Alexander (1995) Michel parameters and τ neutrino helicity from decay correlations in Z → τ+τ−. Physics Letters B, 346 (3-4). pp. 379-388. ISSN 0370-2693

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Abstract

The Michel parameters and the average τ-neutrino helicity are measured using correlations between the decays of the τ+ and τ− produced on the Z resonance and observed in the ALEPH detector at LEP. The Michel parameters, ϱl, ηl, ξl, (δξ)l, are determined from with l = (e, μ), and the average τ neutrino helicity, 〈h(ντ)〉, from τ → hν with h = (π, ϱ, a1). The results obtained with e−μ universality are: ϱl = 0.751±0.039±0.022, ηl = −0.04±0.15±0.11, ξl = 1.18±0.15±0.06, (δξ)l = 0.88±0.11±0.07, and the average τ neutrino helicity 〈h(ντ)〉 = −1.006±0.032±0.019. No significant deviation from the Standard Model V-A prediction is observed.

Item Type:
Journal Article
Journal or Publication Title:
Physics Letters B
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
64080
Deposited By:
Deposited On:
09 May 2013 14:02
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:27