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Résumé |
The existence of extra Higgses in Nature could lead to a cosmological first order electroweak (EW) phase
transition and explain the origin of the matter-antimatter asymmetry in the Universe. We discuss two
possible such scenarios, analyzing the LHC `smoking gun' signatures of such a phase transition: We first
consider a two-Higgs-doublet model, and show that the observation of the decay A0 -> H0 Z at the 14
TeV run of LHC in llbb or llW+W- final states would signal a strong EW phase transition as required
by baryogenesis. We then discuss Higgs portal scenarios, where resonant di-Higgs production may
constitute a powerful probe of the nature of the phase transition. |
