Low-energy neutrino Majorana phases and charged-lepton electric dipole moments

André De Gouvêa*, Shrihari Gopalakrishna

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


If the neutrinos are Majorana fermions, there are at least three new, potentially observable CP-odd phases that parametrize CP-invariance violating phenomena. We currently have no information regarding any of them and know that two out of the three, the so-called Majorana phases, are very hard to access experimentally. Here, we discuss the effect of Majorana phases on charged-lepton electric dipole moments (EDM), and explicitly show that neutrino Majorana phases induce EDMs even in the absence of other sources of CP-invariance violation. We also argue that while the Majorana neutrino contribution to EDMs is tiny, there is one generic ultraviolet completion to the standard model plus massive Majorana neutrinos-the standard model plus a triplet Higgs boson-that leads to significantly enhanced contributions which are still proportional to the low-energy neutrino Majorana phases. If this particular scenario is realized in nature, it seems possible, at least in principle, to measure the Majorana phases by precisely measuring charged-lepton EDMs.

Original languageEnglish (US)
Article number093008
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number9
StatePublished - Nov 1 2005

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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