Electroweak Phase Transition in Non-Minimal Higgs Sectors

TL;DR

This paper explores how extended Higgs sectors beyond the Standard Model can facilitate a strong first order electroweak phase transition, which is crucial for explaining the matter-antimatter asymmetry in the universe, analyzing specific models and their collider signatures.

Contribution

It investigates the CP-violating 2-Higgs-Doublet Model and N2HDM for their ability to produce a strong first order electroweak phase transition, including collider phenomenology implications.

Findings

Identified parameter regions compatible with SFOEWPT in C2HDM and N2HDM.

Provided benchmark points with distinct di-Higgs signatures.

Analyzed collider phenomenology related to Higgs pair production.

Abstract

Higgs sector extensions beyond the Standard Model (BSM) provide additional sources of CP violation and further scalar states that help to trigger a strong first order electroweak phase transition (SFOEWPT) required to generate the observed baryon asymmetry of the Universe through electroweak baryogenesis. We investigate the CP-violating 2-Higgs-Doublet Model (C2HDM) and the Next-to-Minimal 2-Higgs-Doublet Model (N2HDM) with respect to their potential to generate an SFOEWPT while being compatible with all relevant and recent theoretical and experimental constraints. The implications of an SFOEWPT on the collider phenomenology of the two models are analysed in detail in particular with respect to Higgs pair production. We provide benchmark points for parameter points that are compatible with an SFOEWPT and provide distinct di-Higgs signatures.