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

Abstract : This note presents a combination of published and preliminary electroweak results from the four LEP collaborations ALEPH, DELPHI, L3 and OPAL based on electron-positron collision data taken at centre-of-mass energies above the Z-pole, $130 \GeV$ to $209 \GeV$ (\LEPII), as prepared for the 2006 summer conferences. 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. An investigation of the interference of photon and Z-boson exchange is presented, and colour reconnection and Bose-Einstein correlation analyses in W-pair production are combined. The main changes with respect to the experimental results presented in 2005 are new preliminary combinations of final {\LEPII} results on the mass and width of the W boson. Including the precision electroweak measurements performed at the Z pole published recently, the results are compared with precise electroweak measurements from other experiments, notably CDF and D{\O}at the Tevatron. Constraints on the input parameters of the Standard Model are derived from the results obtained in high-$Q^2$ interactions, and used to predict results in low-$Q^2$ experiments, such as atomic parity violation, M{ö}ller scattering, and neutrino-nucleon scattering.
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Contributor : Claudine Bombar <>
Submitted on : Monday, January 22, 2007 - 4:55:16 PM
Last modification on : Wednesday, July 22, 2020 - 9:54:11 AM

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J. Alcaraz, P. Azzurri, E. Barberio, A. Blondel, P. Checchia, et al.. A Combination of Preliminary Electroweak Measurements and Constraints on the Standard Model. 2006. ⟨in2p3-00125837⟩