Baryon Asymmetry and Dark Matter Through the Vector-Like Portal

TL;DR

This paper explores a model connecting baryon asymmetry and dark matter via vector-like fermions, proposing explicit renormalizable models with asymmetric dark matter and potential observable signatures like invisible Higgs decays.

Contribution

It introduces a novel vector-like portal framework linking baryogenesis and dark matter, with explicit models addressing naturalness and predicting dark matter mass.

Findings

Explicit renormalizable models connecting baryon asymmetry and dark matter.

Dark matter candidates have predicted masses within the models.

Potential for significant invisible Higgs decay into dark matter.

Abstract

A possible connection between the cosmological baryon asymmetry, dark matter and vector-like fermions is investigated. In this scenario an asymmetry generated through baryogenesis or leptogenesis (in the vector-like matter sector) connects the baryon asymmetry to the dark matter density. We present explicit renormalizable models where this connection occurs. These models have asymmetric dark matter and a significant invisible Higgs decay width to dark matter particles is possible. We refer to this type of scenario as the vector-like portal. In some asymmetric dark matter models there are potential naturalness issues for the low energy effective theory. We address that issue in the models we consider by starting with a Lagrangian that is the most general renormalizable one consistent with the gauge (and discrete) symmetries and showing the low energy effective theory automatically has the required form as a consequence of the symmetries of the full theory. We show that the mass of the dark matter candidate is predicted in these scenarios.