Abstract
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 H0, A0 and H± that signal such a phase transition, showing that the decay A0 → H0Z at the LHC and a sizable deviation in the Higgs self-coupling λ hhh from its SM value are sensitive indicators of a strongly first order electroweak phase transition in the 2HDM.
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Dorsch, G.C., Huber, S.J., Mimasu, K. et al. The Higgs vacuum uplifted: revisiting the electroweak phase transition with a second Higgs doublet. J. High Energ. Phys. 2017, 86 (2017). https://doi.org/10.1007/JHEP12(2017)086
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DOI: https://doi.org/10.1007/JHEP12(2017)086