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Improved tau polarization measurement

Buskulic, D. and Finch, Alexander (1995) Improved tau polarization measurement. Zeitschrift für Physik C Particles and Fields, 69 (1). pp. 183-193. ISSN 0170-9739

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Abstract

Using 22 pb−1 of data collected at LEP in 1992 on the peak of the Z resonance, the ALEPH collaboration has measured the polarisation of the tau leptons decaying intoevv ¯ ,μvv ¯ ,πν, ρν and a1ν from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parametersNτ andNe, where, in terms of the axial and vector couplingsgAl andgVl,Nl=2gVl gAl/(gVl2+gAl2). This analysis follows to a large extent the methods devised for the 1990 and 1991 data but with improvements which bring a better understanding of the systematic uncertainties. Combining the 1992 measurements with our previously published results yieldsNτ=0.136±0.012±0.009 andNe=0.129±0.016±0.005. Assuminge−τ universality, the measurements imply an effective weak mixing angle of sin2θWeff=0.2332±0.0014.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 64077
Deposited By: ep_importer_pure
Deposited On: 09 May 2013 16:28
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:06
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/64077

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