A measurement of τ polarization at LEP

Acciarri, M. ; Adam, A. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1994) A measurement of τ polarization at LEP Physics Letters B, 341 (2). pp. 245-256. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0370-2693(94)90316-6


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-ν̅νeντ, τ→π(Kτ, τ → ϱντ and τ →a1ντ. 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 g/g=0.0752±0.0063 (stat)±0.0045 (syst) consistent with the hypothesis of e - τ universality. Assuming universality of the e - τ neutral current we determine the effective electroweak mixing angle to be sin2 θeffw = 0.2309 ± 0.0016.

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