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Uncertainties in τ polarization measurement at SLC/LEP and QED/electroweak radiative corrections |
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| Authors: | F Boillot Z Was |
| Institution: | 1. Ecole Polytechnique, LPNHE, Route, de Saclay, F-91128, Palaiseau, France 2. Centre de Physique des Particules de Marseille, Faculté Luminy, CASE 907, F-13288, Marseille Cedex 9, France 3. Max-Planck-Institut für Physik und Astrophysik, F?hringer Ring 6, D-8000, München 40, Federal Republic of Germany |
| Abstract: | We discuss the τ polarization measurement at SLC/LEP energies as a data point in the precision tests of the Glashow-Salam-Weinberg model. Theoretical and experimental uncertainties of this measurement are examined and it is concluded that apart from left-right asymmetry measurement, and for typical values of the parameters of the Standard Model, the τ polarization offers the best probe of the couplings of leptons to the Z0. In particular, the dependence of the τ polarization on the top and Higgs masses is discussed. The interplay of QED initial state bremsstrahlung and other classes of radiative corrections is also discussed. |
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