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Measurement of the e+e→Zγγ cross section and determination of quartic gauge boson couplings at LEP

CollaborationWith : Achard, Pablo / Ambrosi, Giovanni / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Muheim, Franz / Pohl, Martin / Produit, Nicolas / Sciarrino, Deborah
Published in Physics Letters. B. 2000, vol. 478, no. 1-3, p. 39-49
Abstract A first measurement of the cross section of the process e+e−→Zγγ 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−→Zγγ cross section is measured to be0.49 -0.20/-0.17 ±0.04 pb at182.7 GeV and 0.47±0.10±0.04pb at 188.7 GeV. The measurements are consistent with Standard Model expectations. Limits on Quartic Gauge Boson Couplings a0/Λ2 and ac/Λ2 of -0.009 GeV-2<α0/ᴧ2<0.008 GeV-2 and -0.007 GeV-2<αc/ᴧ2<0.013 GeV-2 are derived at 95% confidence level.
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L3 COLLABORATION. Measurement of the e+e→Zγγ cross section and determination of quartic gauge boson couplings at LEP. In: Physics Letters. B, 2000, vol. 478, n° 1-3, p. 39-49. https://archive-ouverte.unige.ch/unige:47333

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Deposited on : 2015-02-27

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