Electroweak Baryogenesis and Higgs Signatures

Abstract

We explore the connection between the strength of the electroweak phase transition and the properties of the Higgs boson. Our interest is in regions of parameter space that can realize electroweak baryogenesis. We do so in a simplified framework in which a single Higgs field couples to new scalar fields charged under SU(3)_c by way of the Higgs portal. Such new scalars can make the electroweak phase transition more strongly first-order, while contributing to the effective Higgs boson couplings to gluons and photons through loop effects. For Higgs boson masses in the range 115 GeV < m_h < 130 GeV, whenever the phase transition becomes strong enough for successful electroweak baryogenesis, we find that Higgs boson properties are modified by an amount observable by the LHC. We also discuss the baryogenesis window of the minimal supersymmetric standard model (MSSM), which appears to be under tension. Furthermore, we argue that the discovery of a Higgs boson with standard model-like couplings to gluons and photons will rule out electroweak baryogenesis in the MSSM.

21 pages, 4 figures; v2 refs added, minor changes, matches journal version

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• Probing the Electroweak Phase Transition with Higgs Factories and Gravitational Waves
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• The 125 GeV Higgs and Electroweak Phase Transition Model Classes
• Electroweak Baryogenesis from Exotic Electroweak Symmetry Breaking
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• Natural SUSY Predicts: Higgs Couplings
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• New Insights of Electroweak Phase Transition in NMSSM
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• Gravitational Waves, baryon asymmetry of the universe and electric dipole moment in the CP-violating NMSSM
• Very Light Scalar Top Quarks at the LHC
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• Nucleation is More than Critical -- A Case Study of the Electroweak Phase Transition in the NMSSM
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• Toward verification of electroweak baryogenesis by electric dipole moments
• Electroweak Baryogenesis in R-symmetric Supersymmetry
• Effects from New Colored States and the Higgs Portal on Gluon Fusion and Higgs Decays
• The energy budget of cosmological first-order phase transitions beyond the bag equation of state
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• Focus Point in the Light Stop Scenario
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• A Real Triplet-Singlet Extended Standard Model: Dark Matter and Collider Phenomenology
• Exploring CP-violation in $Y=0$ inert triplet with real singlet
• Two Higgs bosons near 125 GeV in the complex NMSSM and the LHC Run-I data
• Bubbles kick off primordial black holes to form more binaries