Electroweak Phase Transition in the munuSSM

TL;DR

This paper explores the electroweak phase transition in the munuSSM, identifying conditions for a strong first-order transition suitable for electroweak baryogenesis, including novel phase transition types involving singlet vector space rotation.

Contribution

It demonstrates the viability of electroweak baryogenesis in the munuSSM and uncovers a new class of phase transitions involving singlet vector space rotation.

Findings

Identified parameter regions for strong first-order phase transition.

Discovered a novel phase transition involving singlet vector space rotation.

Supported electroweak baryogenesis in the munuSSM context.

Abstract

An extension of the MSSM called the munuSSM does not allow a conventional thermal leptogenesis scenario because of the low scale seesaw that it utilizes. Hence, we investigate the possibility of electroweak baryogenesis. Specifically, we identify a parameter region for which the electroweak phase transition is sufficiently strongly first order to realize electroweak baryogenesis. In addition to transitions that are similar to those in the NMSSM, we find a novel class of phase transitions in which there is a rotation in the singlet vector space.