Echoes of the Electroweak Phase Transition: Discovering a second Higgs doublet through $A_0\to H_{0}Z$

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 obtain the spectrum and properties of the new scalars $H_0$, $A_0$ and $H^{\pm }$ that signal such a phase transition, and show that the observation of the decay $A_0\to H_{0}Z$ at LHC would be a `smoking gun' signature of these scenarios. We analyze the LHC search prospects for this decay in the $\ell \ell b\bar{b}$ and $\ell \ell W^{+}{W}^{-}$ final states, arguing that current data may be sensitive to this signature in the former channel as well as there being great potential for a discovery in either one at the very early stages of the 14 TeV run.

6 pages, 5 figures

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Cited by in corpus (15)

• Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
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• Constraints on and future prospects for Two-Higgs-Doublet Models in light of the LHC Higgs signal
• The Higgs Vacuum Uplifted: Revisiting the Electroweak Phase Transition with a Second Higgs Doublet
• Electroweak Baryogenesis with Lepton Flavor Violation
• Semi-analytic techniques for calculating bubble wall profiles
• Boosting to identify: pseudoscalar searches with di-leptonic tops
• Low-mass fermiophobic charged Higgs phenomenology in two-Higgs-doublet models
• LHC searches for the CP-odd Higgs by the jet substructure analysis
• CP violation effects in the diphoton spectrum of heavy scalars
• Disfavouring Electroweak Baryogenesis and a hidden Higgs in a CP-violating Two-Higgs-Doublet Model
• Higgs and Z boson associated production via gluon fusion in the SM and the 2HDM
• One-loop considerations for coexisting vacua in the CP conserving 2HDM
• The LHC searches for heavy neutral Higgs bosons by jet substructure analysis
• Electroweak baryogenesis in a scale invariant model and Higgs phenomenology