Scheme for radiative CP violation.

Abstract

We present a simple model in which $\mathrm{CP}$ symmetry is spontaneously broken only after the radiative corrections are taken into account. The model includes two Higgs-boson doublets and two right-handed singlet neutrinos which induce the necessary non-Hermitian interaction. To evade the Georgi-Pais theorem, some fine-tuning of coupling constants is necessary. However, we show that such fine-tuning is natural in the technical sense, as it is protected by symmetry. Some phenomenological consequences are also discussed.