Revisiting Electroweak Phase Transition with Varying Yukawa Coupling Constants

Abstract

We revisited the scenario of electroweak baryogenesis in the presence of large Yukawa couplings, in which it was found previously that a strongly first order electroweak phase transition can occur with the Higgs mass at its observed value of 125 GeV. Given the sensitivity of the running of the Higgs quartic coupling on the Yukawa coupling constants, we find that the addition of order one Yukawa couplings beyond the top quark drastically lowers the scale at which the Higgs potential becomes unstable. Specifically, even with only one additional order one Yukawa coupling, the scalar potential becomes unstable already at the TeV scale, assuming the Standard Model values for the Higgs sector parameters at the electroweak scale. Furthermore, by assuming the Standard Model values for the Higgs sector parameters at the TeV scale, the quartic coupling constant is driven to be larger than its Standard Model value at the electroweak scale. This in turn predicts a much lighter Higgs mass than the measured value of 125 GeV. In this scenario, the strength of the electroweak phase transition is also significantly weakened.

10 pages, 5 figures

References in corpus (5)

• Novel Effects in Electroweak Breaking from a Hidden Sector
• What is the Criterion for a Strong First Order Electroweak Phase Transition in Singlet Models?
• Electroweak Baryogenesis driven by Extra Top Yukawa Couplings
• Flavor Cosmology: Dynamical Yukawas in the Froggatt-Nielsen Mechanism
• The Flavor of Cosmology

Cited by in corpus (9)

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• Varying gauge couplings and collider phenomenology
• RG evolution and effect of intermediate new physics on $\Delta B=2$ six-quark operators
• Vacuum stability of Froggatt-Nielsen models
• Cosmological Stasis from Field-Dependent Decay
• Gravitational Wave Probe of Singlet-Doublet Dark Matter Induced Radiative Neutrino Mass
• Twin electroweak bubble nucleation and gravitational wave under the $S_3$ symmetry of two-Higgs-doublet model