Towards a Scale Free Electroweak Baryogenesis

TL;DR

This paper introduces a novel electroweak baryogenesis mechanism in high-scale supersymmetric models, allowing baryon asymmetry generation at arbitrary scales through a singlet extension with vector-like multiplets.

Contribution

It proposes a scale-free electroweak baryogenesis scenario in high-scale SUSY models with a singlet extension and vector-like multiplets, enabling baryogenesis at any SUSY breaking scale.

Findings

High-temperature first-order phase transition is achievable.

Baryon asymmetry can be generated via lepton number violation.

Singlino is a viable dark matter candidate.

Abstract

We propose a new electroweak baryogenesis scenario in high-scale supersymmetric (SUSY) models. We consider a singlet extension of the minimal SUSY standard model introducing additional vector-like multiplets. We show that the strongly first-order phase transition can occur at a high temperature comparable to the soft SUSY breaking scale. In addition, the proper amount of the baryon asymmetry of the universe can be generated via the lepton number violating process in the vector-like multiplet sector. The typical scale of our scenario, the soft SUSY breaking scale, can be any value. Thus our new electroweak baryogenesis scenario can be realized at arbitrary scales and we call this scenario as a scale free electroweak baryogenesis. This soft SUSY breaking scale is determined by other requirements. If the soft SUSY breaking scale is O(10) TeV, our scenario is compatible with the observed mass of the Higgs boson and the constraints by the electric dipole moments measurements and the flavor experiments. Furthermore, the singlino can be a good candidate of the dark matter.