Study of Triple-Gauge-Boson Couplings ZZZ, ZZgam and Zgamgam at LEP

Abstract

Neutral triple-gauge-boson couplings ZZZ, ZZgam and Zgamgam have been studied with the DELPHI detector using data at energies between 183 and 208 GeV. Limits are derived on these couplings from an analysis of the reactions e+e- -> Zgam, using data from the final states gamma f fbar, with f = q or neutrino, from e+e- -> ZZ, using data from the four-fermion final states q qbar q qbar, q qbar mu+ mu-, q qbar e+ e-, q qbar nu nubar, mu+ mu- nu nubar and e+ e- nu nubar, and from e+e- -> Zgam*, in which the final state gamma is off mass-shell, using data from the four-fermion final states q qbar e+ e- and q qbar mu+ mu-. No evidence for the presence of such couplings is observed, in agreement with the predictions of the Standard Model.

31 pages, 10 figures, Accepted by Euro. Phys. J. C

References in corpus (1)

• Zgamma* production in e+e- interactions at sqrt{s} = 183 - 209 GeV

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• Probing the ZZgamma and Zgammagamma Couplings Through the Process e+e- --> nu anti-nu gamma
• CP-odd contributions to the $Z{Z}^{\ast }\gamma$, $ZZ{\gamma }^{\ast }$, and $ZZ{Z}^{\ast }$ vertices induced by nondiagonal charged scalar boson couplings
• Diboson Production in Proton-Proton Collisions at $\sqrt{s}=7$ TeV
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• Probing triple-gauge couplings in anomalous gauge theories at hadron and lepton colliders
• Study of anomalous gauge boson self-couplings and the role of spin-$1$ polarizations
• NNLO QCD predictions of the asymmetry probe of the $Z\gamma$ pair-production process