Elsevier, Physics Letters B, 1-2(540), p. 43-51, 2002
DOI: 10.1016/s0370-2693(02)02127-5
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The cross section of the process e+e--->Zgammagamma-- >qq¯gammagamma is measured with 215 pb-1 of data collected with the L3 detector during the final LEP run at centre-of-mass energies around 205 GeV and 207 GeV. No deviation from the Standard Model expectation is observed. The full data sample of 713 pb-1, collected above the Z resonance, is used to constrain the coefficients of anomalous quartic gauge boson couplings to: -0.02 GeV-2