Measurement of the W+W-gamma Cross Section and Direct Limits on Anomalous Quartic Gauge Boson Couplings at LEP

Abstract

The process e+e- -> W+W-gamma is analysed using the data collected with the L3 detector at LEP at a centre-of-mass energy of 188.6GeV, corresponding to an integrated luminosity of 176.8pb^-1. Based on a sample of 42 selected W+W- candidates containing an isolated hard photon, the W+W-gamma cross section, defined within phase-space cuts, is measured to be: sigma_WWgamma = 290 +/- 80 +/- 16 fb, consistent with the Standard Model expectation. Including the process e+e- -> nu nu gamma gamma, limits are derived on anomalous contributions to the Standard Model quartic vertices W+W- gamma gamma and W+W-Z gamma at 95% CL: -0.043 GeV^-2 < a_0/Lambda^2 < 0.043 GeV^-2 0.08 GeV^-2 < a_c/Lambda^2 < 0.13 GeV^-2 0.41 GeV^-2 < a_n/Lambda^2 < 0.37 GeV^-2.

References in corpus (5)

• EXCALIBUR -- a Monte Carlo program to evaluate all four fermion processes at LEP 200 and beyond
• Single- and multi-photon final states with missing energy at e+e- colliders
• Measurement of the W+W-gamma Cross-section and First direct Limits on Anomalous Electroweak Quartic Gauge Couplings
• Anomalous Quartic Couplings in $\nu \bar{\nu }\gamma \gamma$ Production via WW-Fusion at LEP2
• Search for Charged Higgs Bosons in e+e- Collisions at Centre-of-Mass Energies up to 202 GeV

Cited by in corpus (9)

• Anomalous Quartic Gauge Boson Couplings at Hadron Colliders
• Study of the W+W-gamma Process and Limits on Anomalous Quartic Gauge Boson Couplings at LEP
• Quartic anomalous couplings at LEP
• The e+e- -> Z gamma gamma -> q q gamma gamma Reaction at LEP and Constraints on Anomalous Quartic Gauge Boson Couplings
• Probing Anomalous Quartic Couplings in e-gamma and gamma-gamma Colliders
• $WWZ/\gamma$ production in large extra dimensions model at LHC and ILC
• Study of the e+e- -> Z gamma gamma -> q q~ gamma gamma Process at LEP
• Rare decay Z --> neutrino antineutrino photon photon via quartic gauge boson couplings
• Indirect Signatures of CP Violation in the Processes $\gamma \gamma \to \gamma \gamma$, $\gamma Z$, and $ZZ$