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A precise determination of the number of families with light neutrinos and of the Z boson partial widths

Decamp, D. and Finch, Alexander (1990) A precise determination of the number of families with light neutrinos and of the Z boson partial widths. Physics Letters B, 235 (3-4). pp. 399-411. ISSN 0370-2693

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Abstract

More extensive and precise results are reported on the parameters of Z decay. On the basis of 20 000 Z decays collected with the ALEPH detector at LEP we find Mz=91.182±0.026 (exp.) ±0.030 (beam) GeV, Γz=2.541±0.056 GeV and σhad0=41.4±0.8 nb. The partial widths for the hadronic and leptonic channels are Γhad=1804±44 MeV, Γe+e−=82.1±3.4 MeV, Γμ+μ−=87.9±6.0 MeV and Γτ+τ−=86.1±5.6 MeV, in good agreement with the standard model. On the basis of the average leptonic width Γℓ+ℓ−=83.9±2.2 MeV, the effective weak mixing angle is found to be sin2θw(Mz)=0.231±0.008. Usin g the partial widths calculated in the standard model, the number of light neutrino families is Nν=3.01±0.15 (exp.)±0.05 (theor.).

Item Type: Article
Journal or Publication Title: Physics Letters B
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 63818
Deposited By: ep_importer_pure
Deposited On: 02 May 2013 15:21
Refereed?: Yes
Published?: Published
Last Modified: 30 Aug 2017 14:05
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/63818

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