Eur. Phys. J. C (2004) 33: 463-476
https://doi.org/10.1140/epjc/s2003-01524-6

experimental physics

Measurement of charged current triple gauge boson couplings using W pairs at LEP

Abstract

Triple gauge boson couplings are measured from W-pair events recorded by the OPAL detector at LEP at centre-of-mass energies of 183 - 209 GeV with a total integrated luminosity of 680 pb^-1. Only CP-conserving couplings are considered and SU(2) x U(1) relations are used, resulting in four independent couplings, and g ^z ₅. Determining each coupling in a separate fit, assuming the other couplings to take their Standard Model values, we obtain , g ^z ₁ = 0.987 ^{+ 0.034} _-0.033, and g ^z ₅ = -0.04 ^{+ 0.13} _-0.12, where the errors include both statistical and systematic uncertainties. Fits are also performed allowing some of the couplings to vary simultaneously. All results are consistent with the Standard Model predictions.