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Measurement of the W+W−γ cross section and direct limits on anomalous 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 / Pohl, Martin
Published in Physics Letters. B. 2000, vol. 490, no. 3-4, p. 187-195
Abstract The process e+e−→W+W−γ is analysed using the data collected with the L3 detector at LEP at a centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 176.8 pb−1. Based on a sample of 42 selected W+W− candidates containing an isolated hard photon, the W+W−γ cross section, defined within phase-space cuts, is measured to be: σWWγ=290±80±16 fb, consistent with the Standard Model expectation. Including the process e+e-→vvγγ , limits are derived on anomalous contributions to the Standard Model quartic vertices W+W−γγ and W+W−Zγ at 95% CL: -0.043 GeV-2 < αo/Δ2< 0.043 GeV-2, -0.08 GeV <αo/Δ2 < 0.13GeV2, -0.041 GeV-2 < αo/Δ2 < 0.37 GeV-2
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L3 COLLABORATION. Measurement of the W+W−γ cross section and direct limits on anomalous quartic gauge boson couplings at LEP. In: Physics Letters. B, 2000, vol. 490, n° 3-4, p. 187-195. https://archive-ouverte.unige.ch/unige:47348

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Deposited on : 2015-02-27

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