CP-violation in the Weinberg 3HDM potential

TL;DR

This paper investigates CP violation phenomena in the Weinberg three-Higgs-doublet model, analyzing vacuum configurations, basis invariants, and phenomenological implications including loop effects and scattering asymmetries.

Contribution

It provides a comprehensive analysis of spontaneous CP violation conditions and phenomenology in the Weinberg 3HDM, including parameter scans and CP-violating couplings.

Findings

Conditions for CP conservation in the model are fully characterized.

Parameter regions with spontaneous CP violation are identified.

Loop-induced CP violation effects in gauge couplings are discussed.

Abstract

We explore the phenomenology of Weinberg's $Z_2\times Z_2$ symmetric three-Higgs-doublet potential, allowing for spontaneous violation of CP due to complex vacuum expectation values. An overview of all possible ways of satisfying the stationary-point conditions is given, with one, two or three non-vanishing vacuum expectation values, together with conditions for CP conservation in terms of basis invariants. All possible ways of satisfying the conditions for CP conservation are given. Scans of allowed parameter regions are given, together with measures of CP violation, in terms of the invariants. The light states identified in an earlier paper are further explored in terms of their CP-violating couplings. Loop-induced CP violation in $WWZ$ couplings, as well as charge-asymmetric scattering are also commented on.