Speaker
Description
We present a discussion of model-independent contributions to the Electric Dipole Moment (EDM) of the electron. We focus on contributions generated by a heavy scalar sector that is linearly realized. In particular, we explore the decoupling limit of the Aligned Two-Higgs Doublet Model (A2HDM). In this model, Barr-Zee diagrams involving a fermion loop produce logarithmically-enhanced contributions that are proportional to potentially large new sources of CP violation. In the decoupling limit these contributions are generated by effective dimension-6 operators via the mixing of four-fermion operators into electroweak dipole operators. Some of these logarithmic contributions are not present in more constrained 2HDM scenarios where a $\mathcal{Z_2}$ symmetry is imposed, since it controls the basis of effective operators needed to describe the new physics contributions to the electron EDM. Thus, the $\mathcal{Z_2}$ symmetry provides a suppression mechanism. We then study how the experimental bounds on the electron EDM constrain the set of parameters of the A2HDM, taking into account additional observables sensitive to CP-violation that receive contributions from this model.