First-order electroweak phase transition powered by additional F-term loop effects in an extended supersymmetric Higgs sector

TL;DR

This paper explores how additional charged scalar bosons in an extended supersymmetric Higgs sector can strengthen the electroweak phase transition, potentially enabling electroweak baryogenesis by modifying the Higgs potential at finite temperature.

Contribution

It introduces a supersymmetric model with extra Higgs and charged singlet fields, demonstrating how nondecoupling loop effects can enhance the first-order electroweak phase transition.

Findings

Enhanced first-order phase transition compared to MSSM

Significant radiative correction to triple Higgs coupling

Potential explanation for the Universe's baryon asymmetry

Abstract

We investigate the one-loop effect of new charged scalar bosons on the Higgs potential at finite temperatures in the supersymmetric standard model with four Higgs doublet chiral superfields as well as a pair of charged singlet chiral superfields. In this model, the mass of the lightest Higgs boson $h$ is determined only by the D-term in the Higgs potential at the tree-level, while the triple Higgs boson coupling for $hhh$ can receive a significant radiative correction due to nondecoupling one-loop contributions of the additional charged scalar bosons. We find that the same nondecoupling mechanism can also contribute to realize stronger first order electroweak phase transition than that in the minimal supersymmetric standard model, which is definitely required for a successful scenario of electroweak baryogenesis. Therefore, this model can be a new candidate for a model in which the baryon asymmetry of the Universe is explained at the electroweak scale.