A Precise measurement of the tau polarization at LEP-1

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(2000) European Physical Journal C. Particles and Fields — Vol. 14, n° 4, p. 585-611 (2000)

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The TeX polarisation has been studied with the TeX data collected by the DELPHI detector at LEP in 1993, 1994 and 1995 around the Z resonance firstly through the exclusive decay channels TeX , TeX , TeX , TeX and TeX and secondly with an inclusive hadronic analysis which benefits from a higher efficiency and a better systematic precision. The results have been combined with those previously published on 1990 to 1992 DELPHI data, to produce results which reflect the full LEP-1 statistics. The fit of the TeX polarisation dependence on the production angle yielded the polarisation parameters TeX and TeX . From these results the ratio of the vector and axial-vector effective couplings TeX and TeX have been derived, compatible with e TeX universality. With the assumption of lepton universality, the ratio of vector to axial-vector effective couplings for leptons TeX was obtained, implying a value of the effective weak mixing angle TeX .
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (2000). A Precise measurement of the tau polarization at LEP-1. European Physical Journal C. Particles and Fields, 14(4), 585-611. https://doi.org/10.1007/s100520000363 (Original work published 2000)