Large electron electric dipole moment in minimal flavor violation framework with Majorana neutrinos
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Journal Volume
89
Journal Issue
9
Date Issued
2014
Author(s)
Abstract
The latest data from the ACME Collaboration have put a stringent constraint on the electric dipole moment de of the electron. Nevertheless, the standard model (SM) prediction for de is many orders of magnitude below the new result, making this observable a powerful probe for physics beyond the SM. We carry out a model-independent study of de in the SM with right-handed neutrinos and its extension with the neutrino seesaw mechanism under the framework of minimal flavor violation. We find that de crucially depends on whether neutrinos are Dirac or Majorana particles. In the Majorana case, de can reach its experimental bound, and it constrains the scale of minimal flavor violation to be above a few hundred GeV or more. We also explore extra CP-violating sources in the Yukawa couplings of the right-handed neutrinos. Such new sources can have important effects on de. © 2014 American Physical Society.
SDGs
Type
journal article