Kavli Affiliate: Jia Liu
| First 5 Authors: Jia Liu, Yuichiro Nakai, Yoshihiro Shigekami, Muyuan Song,
| Summary:
The Two Higgs Doublet Model (2HDM) stands as a promising framework for
exploring physics beyond the Standard Model (SM). Within this context, we
explore the possibility that the two Higgs doublets may serve as a window into
CP-violating dark sectors, neutral under the SM gauge groups. Specifically, our
focus is on investigating the electric dipole moment (EDM) of the electron,
generated solely by CP violation in the dark sector. We present a general
formula for the electron EDM, without specifying the structure of the dark
sectors, and discuss the current constraints on various dark sector models. It
is noteworthy that even in the case of a CP-conserving 2HDM, the resulting
electron EDM is capable of reaching the current experimental limit, with CP
violation arising exclusively from the dark sectors. Furthermore, we introduce
a heavy dark sector (HDS) approximation for the analytic calculation of the
EDM, assuming that the dark sector particles are much heavier than the physical
states in the 2HDM. This approximation yields simplified analytic results that
are consistent with the full numerical calculations.
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