Leptonic CP violation from the seesaw

C. C. Nishi; J. I. Silva-Marcos

Leptonic CP violation from the seesaw

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arxiv 2305.08980 v2 pith:FI6UXY5T submitted 2023-05-15 hep-ph

C. C. Nishi , J. I. Silva-Marcos This is my paper · ORCID

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keywords caseheavyparameterseesawleptonicmassneutrinosphases

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The seesaw extension of the SM explains the tiny neutrino masses and it is accompanied by many CP violating phases. We study the case where all leptonic CP violation arises from the soft breaking in the heavy Majorana mass matrix. Parameter counting reveals that one less parameter is needed to describe this case. This reduction leads to restrictions on the parameter space of heavy neutrinos. We analyze the minimal seesaw case in detail and find that mass degeneracy of heavy neutrinos is not possible for certain values of the CP phases.

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Ultraviolet Flavor Transmission to T-Violating Neutrino Oscillation Observables in a Seesaw Framework with Sterile Mixing and Planck-Suppressed Corrections
hep-ph 2026-08 reject novelty 6.0 of 10

Planck-suppressed corrections to the T-violating neutrino asymmetry are computed through a full high-energy-to-low-energy pipeline and found to lie between 3e-8 and 3e-7, far below DUNE's sensitivity.

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