CP-Violation in the Two Higgs Doublet Model: from the LHC to EDMs

TL;DR

This paper evaluates the potential of the 14 TeV LHC and future EDM experiments to detect CP violation in Two Higgs Doublet Models, focusing on heavy Higgs decays to Z and SM-like Higgs, highlighting the complementarity of collider and low-energy measurements.

Contribution

It provides a combined analysis of LHC and EDM sensitivities to CP-violating 2HDMs, emphasizing the parameter space accessible to both methods and the impact of the alignment limit.

Findings

Significant parameter space accessible to both LHC and EDM experiments.

LHC can detect heavy Higgs decays to Z and Higgs bosons.

EDMs provide complementary constraints on CP violation.

Abstract

We study the prospective sensitivity to CP-violating Two Higgs Doublet Models from the 14 TeV LHC and future electric dipole moment (EDM) experiments. We concentrate on the search for a resonant heavy Higgs that decays to a $Z$ boson and a SM-like Higgs h, leading to the $Z(\ell\ell)h(b\bar{b})$ final state. The prospective LHC reach is analyzed using the Boosted Decision Tree method. We illustrate the complementarity between the LHC and low energy EDM measurements and study the dependence of the physics reach on the degree of deviation from the alignment limit. In all cases, we find that there exists a large part of parameter space that is sensitive to both EDMs and LHC searches.