Measurement of the $W^{+} W^{-} \gamma$ cross-section and direct limits on anomalous quartic gauge boson couplings at LEP

The process e + e − →W + W − γ is analysed using the data collected with the L3 detector at LEP at a centre-of-mass energy of 188.6 GeV , corresponding to an integrated luminosity of 176.8 pb −1 . Based on a sample of 42 selected W + W − candidates containing an isolated hard photon, the W + W − γ cross section, defined within phase-space cuts, is measured to be: σ WW γ =290±80±16 fb, consistent with the Standard Model expectation. Including the process e + e − →ν ν ̄ γγ , limits are derived on anomalous contributions to the Standard Model quartic vertices W + W − γγ and W + W − Z γ at 95% CL: −0.043 GeV −2

electron positron: colliding beams
electron positron: annihilation
W: pair production
photon: associated production
W: hadronic decay
W: leptonic decay
channel cross section
electroweak interaction: validity test
neutrino: pair production
photon: pair production

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Measurement of the W+W−γW^{+} W^{-} \gammaW+W−γ cross-section and direct limits on anomalous quartic gauge boson couplings at LEP

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Measurement of the $W^{+} W^{-} \gamma$ cross-section and direct limits on anomalous quartic gauge boson couplings at LEP