Off-shell structure of the anomalous Z and gamma self-couplings
Abstract
We establish the general off-shell structure of the three neutral gauge boson self-couplings V1*V2*V3*, with applications to the Z*Z*Z*, Z*Z*gamma*, gamma*gamma*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 like those arising in the MSSM. 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 V1*V2*V3*-vertex contribution to the e+e- to (f(bar) f)+(f'(bar) f') amplitude.
Keywords
Cite
@article{arxiv.hep-ph/0005269,
title = {Off-shell structure of the anomalous Z and gamma self-couplings},
author = {G. J. Gounaris and J. Layssac and F. M. Renard},
journal= {arXiv preprint arXiv:hep-ph/0005269},
year = {2011}
}
Comments
37 pages, 7 figures and Addendum to Phys.Rev.D62,073012(2000) e-mail: [email protected]