Measurement of the Z resonance parameters at LEP

ALEPH Collaboration, The and Barate, R. and Bowdery, Christopher and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger and Sloan, Terence and Williams, Mark (2000) Measurement of the Z resonance parameters at LEP. The European Physical Journal C (EPJ C) - Particles and Fields, 14 (1). pp. 1-50. ISSN 1434-6052

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The properties of the Z resonance are measured from the analysis of 4.5 million Z decays into fermion pairs collected with the Aleph detector at LEP. The data are consistent with lepton universality. The resonance parameters are measured to be MZ=(91.1885±0.0031)GeV/c2 , ΓZ=(2.4951±0.0043) GeV, σ0had=(41.559±0.058) nb and, combining the three lepton flavours, Rℓ=20.725±0.039 . The corresponding number of light neutrino species is Nν=2.983±0.013 and the strong coupling constant is αs(MZ)=0.114±0.004±0.002QCD+0.005log10[MH150GeV/c2] . The lepton pair forward-backward asymmetry is measured to be A0,ℓFB=0.0173±0.0016 from which the effective weak mixing angle is derived: sin2θlepteff=0.23089±0.00089 . The measurement of the leptonic width Γℓℓ=84.02±0.15 MeV leads to a determination of the effective ρ parameter ρlepteff=1.0064±0.0018 . The data support the Standard Model and favour a light Higgs.

Item Type:
Journal Article
Journal or Publication Title:
The European Physical Journal C (EPJ C) - Particles and Fields
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?? physics and astronomy (miscellaneous)engineering (miscellaneous) ??
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08 May 2013 10:25
Last Modified:
14 Feb 2024 00:46