The Higgs Vacuum Uplifted: Revisiting the Electroweak Phase Transition with a Second Higgs Doublet

• Published in: arXiv.org
• Main Authors: Dorsch, G C, Huber, S J, Mimasu, K, J M No
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 25.05.2017
• Subjects: Antimatter; Astronomical models; Cosmology; Electroweak model; Phase transitions; Physics - High Energy Physics - Phenomenology; Scalars; Universe
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1705.09186

The existence of a second Higgs doublet in Nature could lead to a cosmological first order electroweak phase transition and explain the origin of the matter-antimatter asymmetry in the Universe. We explore the parameter space of such a two-Higgs-doublet-model and show that a first order electroweak phase transition strongly correlates with a significant uplifting of the Higgs vacuum w.r.t. its Standard Model value. We then obtain the spectrum and properties of the new scalars \(H_0\), \(A_0\) and \(H^{\pm}\) that signal such a phase transition, showing that the decay \(A_0 \rightarrow H_0 Z\) at the LHC and a sizable deviation in the Higgs self-coupling \(\lambda_{hhh}\) from its SM value are sensitive indicators of a strongly first order electroweak phase transition in the 2HDM.