Abstract
By assuming a dynamical source of CP violation, the tension between sufficient CP violation for successful electroweak baryogenesis and strong constraints from current electric dipole moment measurements could be alleviated. We study how to explore such scenarios through gravitational wave detection, collider experiments, and their possible synergies with a well-studied example.
Highlights
Electroweak (EW) baryogenesis becomes a promising and testable mechanism at both particle colliders and gravitational wave (GW) detectors to explain the observed baryon asymmetry of the Universe (BAU), especially after the discovery of the 125 GeV Higgs boson at the LHC [1,2] and the first detection of GWs by Advanced LIGO [3]
The long-standing puzzle of BAU in particle cosmology is quantified by the baryon-to-photon ratio ηB 1⁄4 nB=nγ 1⁄4 5.8–6.6 × 10−10 [4] at 95% confidence level (C.L.), which is determined from the data of the cosmic microwave background radiation or the big bang nucleosynthesis
An important ingredient for successful EW baryogenesis is the existence of a strong first-order phase transition (SFOPT) which can achieve a departure from thermal equilibrium
Summary
Electroweak (EW) baryogenesis becomes a promising and testable mechanism at both particle colliders and gravitational wave (GW) detectors to explain the observed baryon asymmetry of the Universe (BAU), especially after the discovery of the 125 GeV Higgs boson at the LHC [1,2] and the first detection of GWs by Advanced LIGO [3]. In this work, we study the dynamic source of CP violation, which depends on the cosmological evolution of a scalar field This can be realized by the twostep phase transition, where a sufficient CP violation and SFOPT can be satisfied simultaneously to make the EW baryogenesis work. HSi evolves to zero again, and the CP-violating top-quark Yukawa coupling vanishes at the tree level This evolution of the coupling naturally avoids the strong constraints from the EDM measurements and yields distinctive signals at hadron colliders and lepton colliders, such as the LHC, the Circular Electron-Positron.
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