Based on 520 000 fermion pairs accumulated during the first three years of data collection by the ALEPH detector at LEP, updated values of the resonance parameters of the Z are determined to be M Z =(91.187±0.009) GeV, Γ Z =(2.501±0.012) GeV, σ{had/0}=(41.60±0.27) nb, and R ℓ=20.78±0.13. The corresponding number of light neutrino species is N ν=2.97±0.05. The forward-backward asymmetry in lepton-pair decays is used to determine the ratio of vector to axial-vector couplings of leptons: g {/V 2}( M {/Z 2})/ g {/A 2}( M {/Z 2})=0.0052±0.0016. Combining this with ALEPH measurements of the b and c quark asymmetries and τ polarization gives sin2θ{/W eff}=0.2326±0.0013. Assuming the minimal Standard Model, and including measurements of M W / M Z from p bar p colliders and neutrino-nucleon scattering, the mass of the top quark isM_{top} = 156 ± begin{array}{*{20}c} {22} \ {25} \ ± begin{array}{*{20}c} {17} \ {22Higgs} \ GeV.

Update of electroweak parameters fromZ decays / D., B., D., D., C., G., J. P., L., M. N., M., B., M., B., P., R., A., F., A., P., C., J. M., C., M., D., E., F., M., F.B., V., G., Garrido, L.l., T., M., A., P., C., P., A., P., et al.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 60:(1993), pp. 71-81. [10.1007/BF01650432]

Update of electroweak parameters fromZ decays

BOSISIO, LUCIANO;GREGORIO, ANNA;GIANNINI, GIANROSSANO;
1993-01-01

Abstract

Based on 520 000 fermion pairs accumulated during the first three years of data collection by the ALEPH detector at LEP, updated values of the resonance parameters of the Z are determined to be M Z =(91.187±0.009) GeV, Γ Z =(2.501±0.012) GeV, σ{had/0}=(41.60±0.27) nb, and R ℓ=20.78±0.13. The corresponding number of light neutrino species is N ν=2.97±0.05. The forward-backward asymmetry in lepton-pair decays is used to determine the ratio of vector to axial-vector couplings of leptons: g {/V 2}( M {/Z 2})/ g {/A 2}( M {/Z 2})=0.0052±0.0016. Combining this with ALEPH measurements of the b and c quark asymmetries and τ polarization gives sin2θ{/W eff}=0.2326±0.0013. Assuming the minimal Standard Model, and including measurements of M W / M Z from p bar p colliders and neutrino-nucleon scattering, the mass of the top quark isM_{top} = 156 ± begin{array}{*{20}c} {22} \ {25} \ ± begin{array}{*{20}c} {17} \ {22Higgs} \ GeV.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563478
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