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.

arXiv comment31 pages, 10 figures, Accepted by Euro. Phys. J. C

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• Measurements of $Z\gamma$ and $Z\gamma \gamma$ production in $pp$ collisions at $\sqrt{s}=$ 8 TeV with the ATLAS detector
• Measurement of W-gamma and Z-gamma production in pp collisions at sqrt(s) = 7 TeV
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• Anomalous triple gauge boson couplings in $ZZ$ production at the LHC and the role of $Z$ boson polarizations
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• Measurement of the $Z\gamma \to \nu \bar{\nu }\gamma$ production cross section in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector and limits on anomalous triple gauge-boson couplings
• Measurement of the Z gamma production cross section in pp collisions at 8 TeV and search for anomalous triple gauge boson couplings
• Measurement of the $Z(\to {\ell }^{+}{\ell }^{-})\gamma$ production cross-section in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Very Light Axigluons and the Top Asymmetry
• Measurement of the Zgamma to nunugamma cross section and limits on anomalous ZZgamma and Zgammagamma couplings in ppbar collisions at sqrt{s} = 1.96 TeV
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• Heavy Fermion Non-Decoupling Effects in Triple Gauge Boson Vertices
• Probing the ZZgamma and Zgammagamma Couplings Through the Process e+e- --> nu anti-nu gamma
• Finite-width effects in the near-threshold ZZZ and ZWW production at ILC
• New Physics Contribution to Neutral Trilinear Gauge Boson Couplings
• 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