Measurement of Triple-Gauge-Boson Couplings of the W Boson at LEP
Abstract
The CP-conserving triple-gauge-boson couplings, g1Z, kappagamma, lambdagamma, g5Z, kappaZ and lambdaZ are measured using hadronic and semi-leptonic W-pair events selected in 629 pb-1 of data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 209 GeV. The results are combined with previous L3 measurements based on data collected at lower centre-of-mass energies and with the results from single-W production and from events with a single-photon and missing energy. Imposing the constraints kappaZ = g1Z - tan2(thetaW) (kappagamma-1) and lambdaZ = lambdagamma, we obtain for the C and P conserving couplings the results: g1Z = 0.966 +/- 0.033 (stat.) +/- 0.015 (syst.) kappagamma = 1.013 +/-0.066 (stat.) +/- 0.026 (syst.) lambdagamma = -0.021 +/- 0.035 (stat.) +/-0.017 (syst.). Results from the analysis of fully leptonic W-pair decays are also given. All results are in agreement with the Standard Model expectations and confirm the existence of self-couplings among electroweak gauge bosons.
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