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

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