Study of the e+e- -> Z gamma gamma -> q q~ gamma gamma Process at LEP

Abstract

The process e^+e^- -> Z gamma gamma -> q q~ gamma gamma is studied in 0.5 fb-1 of data collected with the L3 detector at centre-of-mass energies between 130.1 GeV and 201.7 GeV. Cross sections are measured and found to be consistent with the Standard Model expectations. The study of the least energetic photon constrains the quartic gauge boson couplings to -0.008 GeV-2 < a_0/Λ^2 < 0.005 GeV-2 and -0.007 GeV-2 < a_c/Λ^2 < 0.011 GeV-2, at 95% confidence level.

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• The e+e- -> Z gamma gamma -> q q gamma gamma Reaction at LEP and Constraints on Anomalous Quartic Gauge Boson Couplings
• Indirect Signatures of CP Violation in the Processes $\gamma \gamma \to \gamma \gamma$, $\gamma Z$, and $ZZ$
• Z-boson production with two unobserved, back-to-back, hard photons at LEP