Constraints on anomalous quartic gauge boson couplings from ννbar γγ and qqbar γγ events at CERN LEP2

Anomalous quartic couplings between the electroweak gauge bosons may contribute to the νν γγ and qq γγ final states produced in e+e- collisions. This analysis uses the LEP2 OPAL data sample at center-of-mass energies up to 209 GeV. Event selections identify νν γγ and qq γγ events in which the two photons are reconstructed within the detector acceptance. The cross section for the process e+e-→qq γγ is measured. Averaging over all energies, the ratio of the observed e+e-→qq γγ cross section to the standard model expectation is R(data/SM)=0.92±0.07±0.04, where the errors represent the statistical and systematic uncertainties respectively. The νν γγ and qq γγ data are used to constrain possible anomalous W+W-γγ and ZZγγ couplings. Combining with previous OPAL results from the W+W-γ final state, the 95% confidence level limits on the anomalous coupling parameters a0Z, acZ, a0W and acW are found to be -0.007 GeV-2

Keywords:

• Large Hadron Collider
• Quantum electrodynamics
• Particle physics
• Quartic function
• Gauge boson
• Physics beyond the Standard Model
• Electroweak interaction
• Physics
• Center of mass
• Photon
• Standard Model

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