Journal of High Energy Physics (Dec 2017)

The Higgs vacuum uplifted: revisiting the electroweak phase transition with a second Higgs doublet

  • G. C. Dorsch,
  • S. J. Huber,
  • K. Mimasu,
  • J. M. No

DOI
https://doi.org/10.1007/JHEP12(2017)086
Journal volume & issue
Vol. 2017, no. 12
pp. 1 – 32

Abstract

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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 H 0, A 0 and H ± that signal such a phase transition, showing that the decay A 0 → H 0 Z 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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