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Improved measurements of electroweak parameters fromZ decays into fermion pairs

Decamp, D. and Finch, Alexander (1992) Improved measurements of electroweak parameters fromZ decays into fermion pairs. Zeitschrift für Physik C Particles and Fields, 53 (1). pp. 1-20. ISSN 0170-9739

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Abstract

The properties of theZ resonance are measured on the basis of 190 000Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality,Mz=(91.182±0.009exp±0.020L∶P) GeV,ГZ=(2484±17) MeV, σhad0=(41.44±0.36) nb, andГjad/Гℓℓ=21.00±0.20. The corresponding number of light neutrino species is 2.97±0.07. The forward-back-ward asymmetry in leptonic decays is used to determine the ratio of vector to axial-vector coupling constants of leptons:gv2(MZ2)/gA2(MZ2)=0.0072±0.0027. Combining these results with ALEPH results on quark charge andbb ¯ asymmetries, and τ polarization, sin2θW(MZ2). In the contex of the Minimal Standard Model, limits are placed on the top-quark mass.

Item Type: Article
Journal or Publication Title: Zeitschrift für Physik C Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63791
Deposited By: ep_importer_pure
Deposited On: 07 May 2013 15:26
Refereed?: Yes
Published?: Published
Last Modified: 20 Sep 2017 06:27
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63791

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