Electric Dipole Moments of Charged Leptons with Sterile Fermions

Understand

We address the impact of sterile fermions on charged lepton electric dipole moments.

• Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model providing new sources of CP violation.
• In this work, we consider a minimal extension of the Standard Model via the addition of sterile fermions which mix with active neutrinos and we derive the corresponding analytical expressions for the electric dipole moments of charged leptons at two-loop order.
• Our study reveals that, in order to have a non-vanishing contribution in this framework, the minimal extension necessitates the addition of at least 2 sterile fermion states to the Standard Model field content.