Electroweak Phase Transition in the U(1)' MSSM

TL;DR

This paper investigates the electroweak phase transition in a U(1) extended MSSM, showing it can be strongly first order due to singlet interactions and vacuum evolution, without exotic fields.

Contribution

It provides an exact finite-temperature effective potential analysis of the U(1)' MSSM, highlighting conditions for a strong first-order phase transition.

Findings

Electroweak phase transition can be strongly first order in the model.

Singlet-doublet interactions influence the transition strength.

Vacuum evolution delays the transition, affecting its nature.

Abstract

In this work, we have investigated the nature of the electroweak phase transition in the U(1) extended minimal supersymmetric standard model without introducing any exotic fields. The effective potential has been estimated exactly at finite temperature taking into account the whole particle spectrum. For reasonable values of the lightest Higgs and neutralino, we found that the electroweak phase transition could be strongly first order due to: (1) the interactions of the singlet with the doublets in the effective potential, and (2) the evolution of the wrong vacuum that delays the transition.