The properties of the Z resonance are measured on the basis of 190000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, M(Z) = (91.182 +/- 0.009exp +/- 0.020L;P) GeV, GAMMA(Z) = (2484 +/- 17) MeV, sigma(had)0 = (41.44 +/- 0.36) nb, and GAMMA(had)/GAMMA(ll) = 21.00 +/- 0.20. The corresponding number of light neutrino species is 2.97 +/- 0.07. The forward-backward 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 bbBAR asymmetries, and tau-polarization, sin2 theta(W)(M(Z)2) = 0.2312 +/- 0.0018. In the context of the Minimal Standard Model, limits are placed on the top-quark mass.

Improved measurements of electroweak parameters from Z decays into fermion pairs / Decamp, D., Deschizeaux, B., Goy, C., Lees, J.-P., Minard, M.-N., Alemany, R., Crespo, J.M., Delfino, M., Fernandez, E., Gaitan, V., Garrido, Ll., Mir, Ll.M., Pacheco, A., Catanesi, M.G., Creanza, D., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., Maggi, M., et al.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 53:1(1992), pp. 1-20. [10.1007/BF01483868]

Improved measurements of electroweak parameters from Z decays into fermion pairs

Creanza, D.;Iaselli, G.;Maggi, G.;
1992

Abstract

The properties of the Z resonance are measured on the basis of 190000 Z decays into fermion pairs collected with the ALEPH detector at LEP. Assuming lepton universality, M(Z) = (91.182 +/- 0.009exp +/- 0.020L;P) GeV, GAMMA(Z) = (2484 +/- 17) MeV, sigma(had)0 = (41.44 +/- 0.36) nb, and GAMMA(had)/GAMMA(ll) = 21.00 +/- 0.20. The corresponding number of light neutrino species is 2.97 +/- 0.07. The forward-backward 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 bbBAR asymmetries, and tau-polarization, sin2 theta(W)(M(Z)2) = 0.2312 +/- 0.0018. In the context of the Minimal Standard Model, limits are placed on the top-quark mass.
1992
Improved measurements of electroweak parameters from Z decays into fermion pairs / Decamp, D., Deschizeaux, B., Goy, C., Lees, J.-P., Minard, M.-N., Alemany, R., Crespo, J.M., Delfino, M., Fernandez, E., Gaitan, V., Garrido, Ll., Mir, Ll.M., Pacheco, A., Catanesi, M.G., Creanza, D., de Palma, M., Farilla, A., Iaselli, G., Maggi, G., Maggi, M., et al.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 53:1(1992), pp. 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/11589/917
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