Post-ACME2013 CP-violation in Higgs Physics and Electroweak Baryogenesis

Abstract

We present a class of cancellation mechanisms to suppress the total contributions of Barr-Zee diagrams to the electron electric dipole moment (eEDM). This class of mechanisms are of particular significance after the new eEDM upper limit, which strongly constrains the allowed magnitude of CP-violation in Higgs couplings and hence the feasibility of electroweak baryogenesis (EWBG), were released by the ACME collaboration in 2013. We point out: if both the CP-odd Higgs-photon-photon ($Z$ boson) and the CP-odd Higgs-electron-positron couplings are turned on, a cancellation may occur either between the contributions of a CP-mixing Higgs boson, with the other Higgs bosons being decoupled, or between the contributions of a CP-even and a CP-odd Higgs bosons. With the assistance of the cancellation mechanisms, a large CP-phase in Higgs couplings with viable electroweak baryogenesis (EWBG) is still allowed. The reopened parameter regions would be probed by the future neutron, mercury EDM measurements, and direct measurements of Higgs CP-properties at the LHC and future colliders.

9 pages, 4 figures, 2 tables

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Cited by in corpus (8)

• Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the Universe
• Electroweak phase transition and Higgs phenomenology in the Georgi-Machacek model
• Higgs pair productions in the CP-violating two-Higgs-doublet model
• New benchmark scenarios of electroweak baryogenesis in aligned two Higgs double models
• CP violating effects in ${}^{210}$Fr and prospects for new physics beyond the Standard Model
• CP violation effects in the diphoton spectrum of heavy scalars
• Complementarity of LHC and EDMs for Exploring Higgs CP Violation
• Higgs Pair Productions in the CP-violating Two-Higgs-Doublet Model