The properties of the Z resonance are measured on the basis of 190 000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, Mz=(91.182±0.009exp±0.020L:P ) GeV, G{cyrillic}Z=(2484±17) MeV, σhad 0=(41.44±0.36) nb, and G{cyrillic}jad/G{cyrillic}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:gv 2(MZ 2)/gA 2(MZ 2)=0.0072±0.0027. Combining these results with ALEPH results on quark charge and {Mathematical expression} asymmetries, and τ polarization, sin2θW(MZ 2). In the contex of the Minimal Standard Model, limits are placed on the top-quark mass.

Decamp, D., Deschizeaux, B., Goy, C., Lees, J., Minard, M., Alemany, R., et al. (1992). Improved measurements of electroweak parameters from Z decays into fermion pairs. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 53(1), 1-20 [10.1007/BF01483868].

Improved measurements of electroweak parameters from Z decays into fermion pairs

CARPINELLI, Massimo;
1992

Abstract

The properties of the Z resonance are measured on the basis of 190 000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, Mz=(91.182±0.009exp±0.020L:P ) GeV, G{cyrillic}Z=(2484±17) MeV, σhad 0=(41.44±0.36) nb, and G{cyrillic}jad/G{cyrillic}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:gv 2(MZ 2)/gA 2(MZ 2)=0.0072±0.0027. Combining these results with ALEPH results on quark charge and {Mathematical expression} asymmetries, and τ polarization, sin2θW(MZ 2). In the contex of the Minimal Standard Model, limits are placed on the top-quark mass.
Articolo in rivista - Articolo scientifico
ALEPH detector
English
1992
53
1
1
20
none
Decamp, D., Deschizeaux, B., Goy, C., Lees, J., Minard, M., Alemany, R., et al. (1992). Improved measurements of electroweak parameters from Z decays into fermion pairs. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 53(1), 1-20 [10.1007/BF01483868].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390439
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