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A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model

Abstract : his note presents a combination of published and preliminary electroweak results from the four LEP collaborations and the SLD collaboration which were prepared for the 2002 summer conferences. Averages from Z resonance results are derived for hadronic and leptonic cross sections, the leptonic forward-backward asymmetries, the tau polarisation asymmetries, the b-bbar and c-cbar partial widths and forward-backward asymmetries and the q-qbar charge asymmetry. Above the Z resonance, averages are derived for di-fermion cross sections and forward-backward asymmetries, photon-pair, W-pair, Z-pair single-W and single-Z cross sections, electroweak gauge boson couplings, W mass and width and W decay branching ratios. The main changes with respect to the experimental results presented in summer 2001 are updates to the Z-pole heavy flavour results from SLD and LEP, and new combinations of results above the Z pole. A new investigation of the interference of photon and Z-boson exchange is presented. For the first time, colour reconnection and Bose-Einstein correlation analyses in W-pair production are combined. The results are compared with precise electroweak measurements from other experiments, notably the recent final result on the electroweak mixing angle determined in neutrino-nucleon scattering by the NuTeV collaboration. The parameters of the Standard Model are evaluated, first using the combined LEP electroweak measurements, and then using the full set of electroweak results.
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Contributor : Sylvie Flores <>
Submitted on : Tuesday, February 25, 2003 - 11:37:14 AM
Last modification on : Monday, December 14, 2020 - 3:46:39 PM

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D. Abbaneo, C. Ainsly, J. Alcaraz, P. Antilogus, A. Bajo-Vaquero, et al.. A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model. 2002, pp.216. ⟨in2p3-00012567⟩



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