ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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,M z =(91.182±0.009exp±0.020L∶P) GeV,Г Z =(2484±17) MeV, σ had 0 =(41.44±0.36) nb, andГ jad /Г ℓℓ=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:g v 2 (M Z 2 )/g A 2 (M Z 2 )=0.0072±0.0027. Combining these results with ALEPH results on quark charge and $$b\bar b$$ asymmetries, and τ polarization, sin2 θ W (M Z 2 ). In the contex of the Minimal Standard Model, limits are placed on the top-quark mass.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01483868
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