IDMS: Inert Dark Matter Model with a complex singlet

TL;DR

This paper introduces the IDMS, an extension of the inert doublet model with a complex singlet, aiming to provide additional CP violation and explore implications for dark matter and baryogenesis.

Contribution

The paper constructs and analyzes the scalar potential of the IDMS, incorporating a complex singlet and a softly broken U(1) symmetry to reduce parameters and study scalar phenomenology.

Findings

Scalar masses and interactions are characterized for benchmark scenarios.

Constraints from LHC Higgs data are considered.

Dark matter experimental bounds are discussed.

Abstract

Within the Inert Doublet Model (IDM) there is a viable dark matter candidate. This simple model can provide a strong enough first order phase transition, which is required in order to account for the matter-antimatter asymmetry in the Universe (BAU). However, another necessary ingredient is missing, as there is no additional source of CP violation in the IDM, besides the standard CKM phase from the Standard Model. Additional CP violating phase can appear if a complex singlet of $SU(3)_C \times SU(2)_W \times U(1)_Y$ with a non-zero vacuum expectation value is added to the scalar sector of the IDM. We construct the scalar potential of the inert doublet plus singlet model (IDMS), assuming an exact $Z_2$ symmetry, with singlet being $Z_2$-even. To simplify the model we use a softly broken $U(1)$ symmetry, which allows a reduction of the number of free parameters in the potential. We study the masses and interactions of scalar particles for a few benchmark scenarios. Constraints from collider physics, in particular from the Higgs signal observed at LHC with $M_h\approx 125$ GeV are discussed, as well as constraints from the dark matter experiments.