Study of the W+W-gamma Process and Limits on Anomalous Quartic Gauge Boson Couplings at LEP

TL;DR

This paper analyzes the W+W- gamma process at LEP, measuring cross sections consistent with the Standard Model and setting limits on possible anomalous quartic gauge boson couplings using extensive data.

Contribution

It provides new measurements of W+W- gamma production at LEP energies and establishes limits on anomalous gauge couplings, enhancing understanding of electroweak interactions.

Findings

W+W- gamma cross sections agree with Standard Model

No evidence of anomalous quartic gauge couplings

Set 95% confidence level limits on couplings

Abstract

The process e+e- -> W+ W- gamma is studied using the data collected by the L3 detector at LEP. New results, corresponding to an integrated luminosity of 427.4 pb-1 at centre-of-mass energies from 192 GeV to 207 GeV, are presented. The W+W- gamma cross sections are measured to be in agreement with Standard Model expectations. No hints of anomalous quartic gauge boson couplings are observed. Limits at 95% confidence level are derived using also the process e+e- --> nu nubar gamma gamma.