Measurement of Triple-Gauge-Boson Couplings of the W Boson at LEP

TL;DR

This paper measures the triple-gauge-boson couplings of the W boson at LEP, confirming the Standard Model predictions and constraining the structure of electroweak gauge boson self-couplings.

Contribution

First measurement of W boson triple-gauge-boson couplings at LEP across multiple energies, confirming Standard Model predictions and constraining possible deviations.

Findings

Results agree with Standard Model expectations.

Confirmed the existence of W boson self-couplings.

Provided constraints on the structure of gauge boson interactions.

Abstract

We report on measurements of the triple-gauge-boson couplings of the W boson in e+e- collisions with the L3 detector at LEP. W-pair, single-W and single-photon events are analysed in a data sample corresponding to a total luminosity of 76.7 pb^{-1} collected at centre-of-mass energies between 161 GeV and 183 GeV. CP-conserving as well as both C- and P-conserving triple-gauge-boson couplings are determined. The results, in good agreement with the Standard-Model expectations, confirm the existence of the self coupling among the electroweak gauge bosons and constrain its structure.