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.