Electroweak baryogenesis in the three-loop neutrino mass model with dark matter

TL;DR

This paper explores electroweak baryogenesis within a three-loop neutrino mass model that includes dark matter, demonstrating it can generate the observed baryon asymmetry while satisfying experimental constraints through CP-violating phases and phenomenological simplifications.

Contribution

The study shows that a three-loop neutrino mass model with dark matter can successfully produce baryon asymmetry via electroweak baryogenesis, incorporating multiple CP-violating phases and phenomenological assumptions.

Findings

Model can generate observed baryon asymmetry.

Compatible with electric dipole moment constraints.

Simultaneously explains neutrino mass and dark matter.

Abstract

Baryon asymmetry of the Universe is evaluated in the model originally proposed in Phys. Rev. Lett. 102 (2009) 051805, where Majorana masses of neutrinos are generated via three-loop diagrams composed of additional scalar bosons including the dark matter candidate which is odd under an unbroken $Z_2$ symmetry. In order for the model to include multiple CP-violating phases, we do not impose the softly broken $Z_2$ symmetry imposed in the original model to avoid the flavor-changing neutral current at tree level. Instead, for simplicity, we assume the flavor alignment structure in the Yukawa interactions. We also simply assume the alignment structure in the Higgs potential so that the Higgs couplings coincide with those in the SM at tree level. Under these phenomenological simplifications, the model still contains multiple CP-violating phases. By using destructive interferences among them, it is compatible with the stringent constraint from the electric dipole moment measurements to generate the observed baryon asymmetry along with the scenario of electroweak baryogenesis. We show a benchmark scenario which can explain neutrino mass, dark matter and baryon asymmetry of the universe simultaneously and can satisfy all the other available experimental data. Some phenomenological predictions of the model are also discussed.