CP Violating Two-Higgs-Doublet Model: Constraints and LHC Predictions

TL;DR

This paper investigates a CP-violating Two-Higgs-Doublet Model of Type-I, analyzing current constraints and predicting LHC signatures, especially the decay of neutral Higgs bosons into gauge boson pairs as a key indicator.

Contribution

It provides a comprehensive analysis of CPV 2HDM Type-I, including constraints and specific LHC predictions for observing CP violation through Higgs decays.

Findings

Constraints on CPV 2HDM Type-I are established.

Predicted decay channels include Higgs bosons decaying into WW and ZZ.

LHC Run 2 can potentially observe these signatures as evidence of CP violation.

Abstract

Two-Higgs-Doublet Models (2HDMs) are amongst the simplest extensions of the Standard Model. Such models allow for tree-level CP Violation (CPV) in the Higgs sector. We analyse a class of CPV 2HDM (of Type-I) in which only one of the two Higgs doublets couples to quarks and leptons, avoiding dangerous Flavour Changing Neutral Currents. We provide an up to date and comprehensive analysis of the constraints and Large Hadron Collider (LHC) predictions of such a model. Of immediate interest to the LHC Run 2 is the golden channel where all three neutral Higgs bosons are observed to decay into gauge boson pairs, $WW$ and $ZZ$, providing a smoking gun signature of the CPV 2HDM.