Toward verification of electroweak baryogenesis by electric dipole moments

TL;DR

This paper explores how electric dipole moments can serve as probes for electroweak baryogenesis in extended Higgs models, analyzing CP violation effects and their relation to baryon asymmetry.

Contribution

It provides a detailed analysis of CP-violating interactions and their impact on BAU and EDMs, highlighting the conditions under which electron EDM measurements can verify electroweak baryogenesis.

Findings

Electron EDM strongly probes BAU-related CP violation.

Correlation between BAU and EDM can be lost if non-BAU CP violation dominates.

Higgs physics offers an alternative verification method.

Abstract

We study general aspects of the CP-violating effects on the baryon asymmetry of the Universe (BAU) and electric dipole moments (EDMs) in models extended by an extra Higgs doublet and a singlet, together with electroweak-interacting fermions. In particular, the emphasis is on the structure of the CP-violating interactions and dependences of the BAU and EDMs on masses of the relevant particles. In a concrete mode, we investigate a relationship between the BAU and the electron EDM for a typical parameter set. As long as the BAU-related CP violation predominantly exists, the electron EDM has a strong power in probing electroweak baryogenesis. However, once a BAU-unrelated CP violation comes into play, the direct correlation between the BAU and electron EDM can be lost. Even in such a case, we point out that verifiability of the scenario still remains with the help of Higgs physics.