CP violation in 2HDM and EFT: the ZZZ vertex
Abstract
We study the CP violating ZZZ vertex in the two-Higgs doublet model, which is a probe of a Jarlskog-type invariant in the extended Higgs sector. The form factor is evaluated at one loop in a general gauge and its magnitude is estimated in the realistic parameter space. Then we turn to the decoupling limit of the two-Higgs doublet model, where the extra scalars are heavy and the physics can be described by the Standard Model supplemented by higher-dimensional operators. The leading operator contributing to at one loop is identified. The CP violating ZZZ vertex is not generated in the effective theory by dimension-8 operators, but instead arises only at the dimension-12 level, which implies an additional suppression by powers of the heavy Higgs mass scale.
Cite
@article{arxiv.1710.05563,
title = {CP violation in 2HDM and EFT: the ZZZ vertex},
author = {Hermès Bélusca-Maïto and Adam Falkowski and Duarte Fontes and Jorge. C. Romão and João P. Silva},
journal= {arXiv preprint arXiv:1710.05563},
year = {2020}
}
Comments
21 pages; v2: added references and comments, appendix A on method of regions, and appendix B on derivation of CP-violating effective Lagrangian. Corrected discussion of dimension-12 operators contributing to ZZZ vertex. Final JHEP version