First Order Electroweak Phase Transition from Weakly Coupled sub-GeV Physics and Possible Connection to Fermion Flavor

Abstract

We propose that the dynamics of a scalar $\varphi$ of mass $O(10)$ MeV that is weakly coupled to the Higgs can lead to a first order electroweak phase transition, fulfilling a key requirement for baryogenesis. Stability of the model near the weak scale requires a suppressed - possibly vanishing - top Yukawa coupling to the Higgs before the transition which rises to the Standard Model value afterwards. This can be accomplished through the dynamics of $\varphi$ via a dimension-5 operator. We conjecture that the entire Standard Model flavor structure could turn on, mutatis mutandis, after the electroweak phase transition, via dimension-5 interactions of $\varphi$ suppressed by scales ranging from $O(10^3)$ TeV to near Planck mass. Due to its suppressed couplings, $\varphi$ is long-lived and can lead to missing energy signals in rare kaon decays, which can be probed by the KOTO experiment.

arXiv comment8 pages, 4 figures. Replaced with the version accepted for publication in PRD. Several references and some discussion of baryogenesis added

References in corpus (36)

• Detecting gravitational waves from cosmological phase transitions with LISA: an update
• Singlet Higgs Phenomenology and the Electroweak Phase Transition
• First-Order Electroweak Phase Transition in the Standard Model with a Low Cutoff
• Opening the Window for Electroweak Baryogenesis
• Kaon Decays in the Standard Model
• Probing Light Thermal Dark-Matter With a Higgs Portal Mediator
• Dynamics of Non-renormalizable Electroweak Symmetry Breaking
• Finite temperature field theory and phase transitions
• Strong First Order Electroweak Phase Transition in the CP-Conserving 2HDM Revisited
• Electroweak baryogenesis and quantum corrections to the triple Higgs boson coupling
• Probing the Higgs Portal at the LHC Through Resonant di-Higgs Production
• Higgs Self-Coupling as a Probe of Electroweak Phase Transition
• Electroweak Baryogenesis and New TeV Fermions
• On the electroweak phase transition in the Minimal Supersymmetric Standard Model
• Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model
• The Electroweak Phase Transition: A Collider Target
• Flavor-specific scalar mediators
• Higgs Couplings and Electroweak Phase Transition
• Non-resonant Collider Signatures of a Singlet-Driven Electroweak Phase Transition
• Implications of a Light "Dark Higgs" Solution to the $g_{\mu }-2$ Discrepancy
• Light Scalars and the KOTO Anomaly
• New physics implications of recent search for $K_L\to {\pi }^0\nu \bar{\nu }$ at KOTO
• Exotic Higgs Decays and the Electroweak Phase Transition
• Revisiting supernova constraints on a light CP-even scalar
• Study of the $K_L\to {\pi }^0\nu \overline{\nu }$ Decay at the J-PARC KOTO Experiment
• The role of leptons in electroweak baryogenesis
• Electroweak Phase Transition, Higgs Diphoton Rate, and New Heavy Fermions
• LSND Constraints on the Higgs Portal
• Singlet Assisted Vacuum Stability and the Higgs to Diphoton Rate
• Lepton-mediated electroweak baryogenesis
• Flavor Cosmology: Dynamical Yukawas in the Froggatt-Nielsen Mechanism
• Electroweak Phase Transition with an SU(2) Dark Sector
• Electroweak Phase Transition in Non-Minimal Higgs Sectors
• Adiabatic Electroweak Baryogenesis Driven by an Axion-like Particle
• Axionic Electroweak Baryogenesis
• Lepton-mediated electroweak baryogenesis, gravitational waves and the $4\tau$ final state at the collider

Cited by in corpus (3)

• A new perspective on the electroweak phase transition in the Standard Model Effective Field Theory
• Screening the Higgs portal
• Shedding light on the electroweak phase transition from exotic Higgs boson decays at the lifetime frontiers