Two-Step Electroweak Baryogenesis

TL;DR

This paper explores a two-step electroweak baryogenesis mechanism where baryon asymmetry is generated and preserved during a two-phase symmetry breaking process, with implications for CP-violation and EDM constraints.

Contribution

It introduces a detailed analysis of two-step electroweak baryogenesis, including a concrete model demonstrating viability and potential to evade EDM constraints.

Findings

Baryon asymmetry can be generated during the first step and preserved in the second.

CP-violation from a partially excluded sector can produce observed asymmetry.

Scenario can evade current and future electric dipole moment constraints.

Abstract

We analyze electroweak baryogenesis during a two-step electroweak symmetry breaking transition, wherein the baryon asymmetry is generated during the first step and preserved during the second. Focusing on the dynamics of CP-violation required for asymmetry generation, we discuss general considerations for successful two-step baryogenesis. Using a concrete model realization, we illustrate in detail the viability of this scenario and the implications for present and future electric dipole moment (EDM) searches. We find that CP-violation associated with a partially excluded sector may yield the observed baryon asymmetry while evading present and future EDM constraints.