Measurement of the e+e- -> W+W-gamma Cross-section and Limits on Anomalous Quartic Gauge Couplings with DELPHI

TL;DR

This paper measures the W+W-gamma production cross-section at LEP2 energies using DELPHI data, confirming Standard Model predictions and setting limits on possible anomalous gauge couplings.

Contribution

First measurement of W+W-gamma cross-section at LEP2 energies, providing constraints on anomalous quartic gauge couplings.

Findings

Measured cross-sections agree with Standard Model

Photon spectra used to set limits on anomalous couplings

No significant deviations observed from Standard Model predictions

Abstract

W+W-gamma production at LEP2 is studied using data collected with the DELPHI detector at centre-of-mass energies between 189 GeV and 209 GeV, corresponding to an integrated luminosity of about 600 pb^-1. Cross-sections are measured for the production of W+W- with a hard, central and isolated photon in the final state, and are found to be compatible with the Standard Model prediction. The photon energy spectra are used to derive limits on anomalous contributions to the W+W-Z0gamma and W+W-gammagamma vertices.