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

Gouvêa, André de; Gopalakrishna, Shrihari

doi:10.1103/physrevd.72.093008

Cited by 24 publications

(26 citation statements)

References 40 publications

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“…[45,47]. In general, there is a very large number (∼ 100) of diagrams contributing to the charged lepton EDM; 4 however and noticing that the heavy (sterile) neutrinos providing the dominant contributions form pseudo-Dirac pairs, the number of diagrams that must be JHEP08(2016)079 evaluated can be significantly reduced, as we will presently discuss.…”

Section: Electric Dipole Momentsmentioning

confidence: 92%

“…Sterile fermions may also contribute to lepton flavour conserving observables such as the dipole moments of charged leptons [45][46][47]. Coupling to the active neutrinos, the sterile fermions may also add new sources of CP violation to the already existing one of the SM, and can thus provide new contributions to different CP-odd observables, among them electric dipole moments (EDMs) [45].…”

Section: Jhep08(2016)079mentioning

confidence: 99%

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Electron electric dipole moment in Inverse Seesaw models

Abada

Toma

2016

J. High Energ. Phys.

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Abstract:We consider the contribution of sterile neutrinos to the electric dipole moment of charged leptons in the most minimal realisation of the Inverse Seesaw mechanism, in which the Standard Model is extended by two right-handed neutrinos and two sterile fermion states. Our study shows that the two pairs of (heavy) pseudo-Dirac mass eigenstates can give significant contributions to the electron electric dipole moment, lying close to future experimental sensitivity if their masses are above the electroweak scale. The major contribution comes from two-loop diagrams with pseudo-Dirac neutrino states running in the loops. In our analysis we further discuss the possibility of having a successful leptogenesis in this framework, compatible with a large electron electric dipole moment.

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Section: Electric Dipole Momentsmentioning

confidence: 92%

Section: Jhep08(2016)079mentioning

confidence: 99%

Electron electric dipole moment in Inverse Seesaw models

Abada

Toma

2016

J. High Energ. Phys.

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“…[43]). Charged-lepton electric dipole moments can be induced from the presence of a heavy neutrino at two loops, but current experiments are not yet sensitive to these effects [44,45].…”

Section: E Magnetic and Electric Dipole Momentsmentioning

confidence: 99%

Global constraints on a heavy neutrino

2016

Self Cite

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We estimate constraints on the existence of a heavy, mostly sterile neutrino with mass between 10 eV and 1 TeV. We improve upon previous analyses by performing a global combination and expanding the experimental inputs to simultaneously include tests for lepton universality, lepton flavor violating processes, electroweak precision data, dipole moments, and neutrinoless double beta decay. Assuming the heavy neutrino and its decay products are invisible to detection, we further include, in a self-consistent manner, constraints from direct kinematic searches, the kinematics of muon decay, cosmology, and neutrino oscillations, in order to estimate constraints on the values of |Ue4| 2 , |Uµ4| 2 , and |Uτ4| 2 .

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“…The limit on |d e |, though larger than the four-loop SM result [12] and the bounds reached via other mechanisms [14,15,16,17], is still about three orders of magnitude below the precision reachable in the near future [19].…”

Section: Approach 1: Model Independent Resultsmentioning

confidence: 99%

Electric dipole moments of charged leptons from their Majorana-type Yukawa couplings

Liao

2009

Physics Letters B

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The electric dipole moments (EDMs) of charged leptons are significantly suppressed in standard model. It has been found previously that they are even more severely suppressed in seesaw type models by powers of tiny neutrino masses as far as a leptonic CP source is concerned. We investigate whether a Majorana-type Yukawa coupling between charged leptons and a doubly charged scalar can contribute significantly to their EDMs. An observable EDM would then help unravel the Majorana nature of neutrinos by a lepton number conserving quantity. We find that the EDMs are indeed parametrically large, of the form d α ∝ em α (m 2 β − m 2 γ )/m 4 up to logarithms, where m α and m are respectively the masses of charged leptons and the scalar. And they satisfy a sum rule to good precision,With the most stringent constraints from lepton flavor violating transitions taken into account, their values are still much larger than the mentioned previous results. Unfortunately, even in the most optimistic case the electron EDM is about three orders of magnitude below the foreseeable experimental sensitivity.

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

Cited by 24 publications

References 40 publications

Electron electric dipole moment in Inverse Seesaw models

Electron electric dipole moment in Inverse Seesaw models

Global constraints on a heavy neutrino

Electric dipole moments of charged leptons from their Majorana-type Yukawa couplings

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