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A MEASUREMENT OF tau-POLARIZATION AT LEP

Abstract:

With a data sample of 86 000 Z → τ+τ-(γ) events collected in 1990 through 1993 we have measured the polarization of τ-leptons as a function of the production polar angle using the following 1-prong τ decay modes: τ-→e-vevτ, τ-→π- (K-)vτ, τ-→ρ{variant}-vτ and τ-→a1-vτ. We obtain for the ratio vector to axial-vector weak neutral couplings for electrons gVe/gAe=0.0791±0.0099(stat)±0.0025 (syst) and taus gVτ/gAτ=0.0752±0.0063 (stat)±0.0045 (syst) consistent with the hypothesis of e - τ universali...

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Publication status:
Published

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Journal:
PHYSICS LETTERS B
Volume:
341
Issue:
2
Pages:
245-256
Publication date:
1994-12-29
DOI:
ISSN:
0370-2693
URN:
uuid:f2259f95-4723-4603-8d8c-8944a67b6d15
Source identifiers:
22750
Local pid:
pubs:22750

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