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

TL;DR

This paper measures the triple gauge boson couplings at LEP using W-pair and photon events, testing the Standard Model predictions at energies between 183 and 209 GeV.

Contribution

It provides the first precise measurement of CP-conserving triple gauge couplings using LEP data, considering SU(2)xU(1) relations and multiple coupling fits.

Findings

Measured couplings are consistent with the Standard Model.

Set limits on possible deviations of gauge couplings.

Enhanced understanding of electroweak interactions.

Abstract

Triple gauge boson couplings are measured from W-pair and single photon events recorded by the OPAL detector at LEP at center-of-mass energies between 183 - 209 GeV with a total integrated luminosity of 680 inverse picobarns. Only CP-conserving couplings are considered and SU(2)xU(1) relations between the WWZ and the WWgamma couolings are used, resulting in four independent couplings. Each coupling is determined in a separate fit, assuming the other couplings to take their Standard Model values. Fits are also done allowing some of the couplings to vary simultaneously. The results are compared with the Standard Model predictions.