Baryogenesis within the two-Higgs-doublet model in the Electroweak scale

TL;DR

This paper proposes a baryogenesis mechanism within a two-Higgs-doublet model at the electroweak scale, compatible with the observed Higgs mass, involving a one-stage phase transition and CP violation at bubble walls.

Contribution

It introduces a novel baryogenesis scenario in a two-Higgs-doublet model that aligns with current Higgs mass measurements and describes the bubble dynamics during the phase transition.

Findings

The model achieves a consistent one-stage phase transition.

Calculated bubble wall velocity and thickness.

Demonstrated CP violation via fermion interactions at bubble boundaries.

Abstract

The conventional baryogenesis mechanism is based on the one Higgs doublet within the standard model, at the electroweak scale $T\sim 100 GeV$. In this model the strong first order phase transition due to the spontaneous symmetry breaking imposes the folowing condition on the mass of the Higgs field: $m_H\lesssim 40 GeV$, which is contrary to the recently observed value $m_H\simeq 126 GeV$. In this paper we propose a baryogenesis mechanism within a two-Higgs-doublet model in which the phase transition occurs in one stage. This model is consistent with the observed mass of the Higgs. We obtain the true vacuum bubble wall velocity and thickness in this model. Then, we use nonlocal baryogenesis mechanism in which the interaction of fermions with the boundary of the expanding bubbles leads to CP violation and sphaleron mediated baryogenesis.