# The $e^+ e^- \to Z\gamma\gamma \to q\overline{q}\gamma\gamma$ Reaction at LEP and Constraints on Anomalous Quartic Gauge Boson Couplings

3 CMS
IP2I Lyon - Institut de Physique des 2 Infinis de Lyon
Abstract : The cross section of the process e^+ e^- -> Z \gamma\gamma -> qq~ \gamma \gamma 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 a_0/\Lambda^2 0.03 GeV^-2 and -0.07 GeV^-2 a_c/\Lambda^2 0.05 GeV^-2, at 95% confidence level.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00011801
Contributor : Sylvie Flores <>
Submitted on : Thursday, July 25, 2002 - 11:20:28 AM
Last modification on : Friday, December 4, 2020 - 1:22:16 PM

### Citation

P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, G. Alemanni, et al.. The $e^+ e^- \to Z\gamma\gamma \to q\overline{q}\gamma\gamma$ Reaction at LEP and Constraints on Anomalous Quartic Gauge Boson Couplings. Physics Letters B, Elsevier, 2002, 540, pp.43-51. ⟨in2p3-00011801⟩

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