![]() |
Off-shell Structure of the Anomalous Z and gamma Self-couplings ![]() Auteur(s): Gounaris G.J., Layssac Jacques, Renard F. M.
(Article) Publié:
Physical Review D, vol. 62 p.073012 (2000)
Texte intégral en Openaccess : Ref Arxiv: hep-ph/0005269 DOI: 10.1103/PhysRevD.62.073012 Ref. & Cit.: NASA ADS 37 citations Résumé: We establish the general off-shell structure of the three neutral gauge boson self-couplings V*1V*2V*3, with applications to the Z*Z*Z*, Z*Z*γ*,γ*γ*Z* cases. New coupling forms appear which do not exist when two gauge bosons are on shell. We give the contribution arising from a fermionic triangle loop. It covers both the standard model (SM) and possible new physics (NP) contributions such as those arising in the minimal supersymmetric SM. For what concerns NP contributions with a high scale, we discuss the validity of an effective Lagrangian involving a limited set of parameters. Finally we write the general expression of the V*1V*2V*3-vertex contribution to the e+e--->(ff¯)+(f'f¯') amplitude. |