Journal article

Constraints on anomalous quartic gauge boson couplings from nu(nu)over-bar gamma gamma and q(q)over-bar gamma gamma events at CERN LEP2

G Abbiendi, C Ainsley, PF Akesson, G Alexander, J Allison, P Amaral, G Anagnostou, KJ Anderson, S Asai, D Axen, G Azuelos, I Bailey, E Barberio, T Barillari, RJ Barlow, RJ Batley, P Bechtle, T Behnke, KW Bell, PJ Bell Show all



Anomalous quartic couplings between the electroweak gauge bosons may contribute to the ννγγ and qq̄γγ 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 ννγγ and qq̄γγ events in which the two photons are reconstructed within the detector acceptance. The cross section for the process e+e-→qq̄γγ is measured. Averaging over all energies, the ratio of the observed e +e-→qq̄γγ 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 ννγγ and qq̄γγ data are used to constrain possible ..

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