CP Violation, Stability and Unitarity of the Two Higgs Doublet Model
Abstract
The Two-Higgs-Doublet Model is considered, in its CP-non-conserving version. It is shown quantitatively how vacuum stability and tree-level unitarity in the Higgs-Higgs-scattering sector constrain the parameter space of the model. In particular, at high values of tanbeta, the model violates unitarity, unless some of the Higgs bosons are heavy. In the regime of large CP violation in the neutral-Higgs-t-quark sector, which requires tanbeta lsim 1, the Yukawa coupling parameter space (determined by the neutral-Higgs-sector rotation matrix) is reasonably unconstrained. On the other hand, the corresponding neutral-Higgs-b-quark sector allows for large CP violation at tanbeta gg 1. However, here the model is more constrained: Significant CP violation is correlated with a considerable splitting among the two heavier Higgs bosons.
Cite
@article{arxiv.hep-ph/0702097,
title = {CP Violation, Stability and Unitarity of the Two Higgs Doublet Model},
author = {Abdul Wahab El Kaffas and Odd Magne Ogreid and Per Osland},
journal= {arXiv preprint arXiv:hep-ph/0702097},
year = {2008}
}
Comments
9 pages, Contribution to "FANS2006", to be published in " Nonlinear Phenomena in Complex Systems"