Improved measurements of electroweak parameters from Z decays into fermion pairs

D. Decamp, B. Deschizeaux, C. Goy, J. P. Lees, M. N. Minard, R. Alemany, J. M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll Garrido, Ll M. Mir, A. Pacheco, M. G. Catanesi, D. Creanza, M. de Palma, A. Farilla, G. Iaselli, G. Maggi, M. MaggiS. Natali, S. Nuzzo, M. Quattromini, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Gao, H. Hu, D. Huang, X. Huang, J. Lin, J. Lou, C. Qiao, T. Ruan, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, W. B. Atwood, L. A.T. Bauerdick, F. Bird, E. Blucher, G. Bonyicini, F. Bossi, J. Boudreau, D. Brown, T. H. Burnett, H. Drevermann, R. W. Forty, C. Grab, R. Hagelberg, S. Haywood, J. Hilgart, B. Jost, M. Kasemann, J. Knobloch, A. Lacourt, E. Lançon, I. Lehraus, T. Lohse, A. Lusiani, A. Marchioro, M. Martinez, P. Mato, S. Menary, A. Minten, A. Miotto, R. Miquel, H. G. Moser, J. Nash, P. Palazzi, F. Ranjard, G. Redlinger, A. Roth, J. Rothberg, H. Rotscheidt, M. Saich, R. St Denis, D. Schlatter, M. Takashima, M. Talby, W. Tejessy, H. Wachsmuth, S. Wasserbaech, S. Wheeler, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, R. El Fellous, A. Falvard, P. Gay

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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, σhad0=(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:gv2(MZ2)/gA 2(MZ2)=0.0072±0.0027. Combining these results with ALEPH results on quark charge and {Mathematical expression} asymmetries, and τ polarization, sin2θW(MZ2). In the contex of the Minimal Standard Model, limits are placed on the top-quark mass. © 1992 Springer-Verlag.
Original languageEnglish
Pages (from-to)1-20
JournalZeitschrift für Physik C Particles and Fields
Volume53
Issue number1
DOIs
Publication statusPublished - 1 Jan 1992

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