Measurement of the $e^{+} e^{-} \to Z \gamma \gamma$ cross-section and determination of quartic gauge boson couplings at LEP

A first measurement of the cross section of the process e + e − →Z γγ is reported using a total integrated luminosity of 231 pb −1 collected with the L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV . By selecting hadronic events with two isolated photons the e + e − →Z γγ cross section is measured to be 0.49 +0.20 −0.17 ±0.04 pb at 182.7 GeV and 0.47±0.10±0.04 pb at 188.7 GeV . The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings a 0 / Λ 2 and a c / Λ 2 of −0.009 GeV −2

electron positron: colliding beams
electron positron: annihilation
photon: pair production
Z0: associated production
Z0: hadronic decay
coupling: (4gauge boson)
channel cross section
electroweak interaction: validity test
L3
experimental results

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Measurement of the e+e−→Zγγe^{+} e^{-} \to Z \gamma \gammae+e−→Zγγ cross-section and determination of quartic gauge boson couplings at LEP

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Measurement of the $e^{+} e^{-} \to Z \gamma \gamma$ cross-section and determination of quartic gauge boson couplings at LEP