The cancellation mechanism in the predictions of electric dipole moments

Abstract

The interpretation of the baryon asymmetry of the Universe necessitates the CP violation beyond the Standard Model (SM). We present a general cancellation mechanism in the theoretical predictions of the electron electric dipole moments (EDM), quark chromo-EDMs, and Weinberg operators. A relative large CP violation in the Higgs sector is allowed by the current electron EDM constraint released by the ACME collaboration in 2013, and the recent ${}^{199}$Hg EDM experiment. The cancellation mechanism can be induced by the mass splitting of heavy Higgs bosons around $\sim \mathcal{O}(0.1-1)$ GeV, and the extent of the mass degeneracy determines the magnitude of the CP-violating phase. We explicate this point by investigating the CP-violating two-Higgs-doublet model and the minimal supersymmetric Standard Model. The cancellation mechanism is general when there are CP violation and mixing in the Higgs sector of new physics models. The CP-violating phases in this scenario can be excluded or detected by the projected ${}^{225}$Ra EDM experiments with precision reaching $\sim 10^{-28}e\cdot \mathrm{cm}$, as well as the future colliders.

7 pages, 5 figures, matches published version

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• Electroweak phase transition and Higgs phenomenology in the Georgi-Machacek model
• Constraining the CP structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
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• CP violation effects in the diphoton spectrum of heavy scalars
• Nuclear electric dipole moment in the cluster model with a triton: ${}^7$Li and ${}^{11}$B
• Probing Dark Sector CP Violation with Electric Dipole Moments and Colliders
• Flavor and CP-violating Higgs sector in two Higgs doublet models with $U(1{)}^{\prime }$
• Testing CP-violation in a Heavy Higgs Sector at CLIC