New singlet and doublet fermions, a scalar singlet, and right-handed neutrinos can simultaneously explain Dirac neutrino masses, dark matter, and a two-step inverse electroweak phase transition with observable gravitational waves.
Electroweak Phase Transition, Higgs Diphoton Rate, and New Heavy Fermions
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abstract
We show that weak scale vector-like fermions with order one couplings to the Higgs can lead to a novel mechanism for a strongly first-order electroweak phase transition (EWPhT), through their tendency to drive the Higgs quartic coupling negative. These same fermions could also enhance the loop-induced branching fraction of the Higgs into two photons, as suggested by the recent discovery of a ~125 GeV Higgs-like state at the CERN Large Hadron Collider (LHC). Our results suggest that measurements of the diphoton decay rate of the Higgs and its self coupling, at the LHC or perhaps at a future lepton collider, could probe the EWPhT in the early Universe, with significant implications for the viability of electroweak baryogenesis scenarios.
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Singlet-Doublet fermion origin of dark matter, neutrino mass and inverse first-order electroweak phase transition
New singlet and doublet fermions, a scalar singlet, and right-handed neutrinos can simultaneously explain Dirac neutrino masses, dark matter, and a two-step inverse electroweak phase transition with observable gravitational waves.