Confronting Four Zero Neutrino Yukawa Textures with $N_2^{}$-dominated Leptogenesis

Abstract

We consider a restricted Type-I seesaw scenario with four texture zeros in the neutrino Yukawa matrix, in the weak basis where both the charged-lepton Yukawa matrix and the Majorana mass matrix for right-handed neutrinos are diagonal and real. Inspired by grand unified theories, we further require the neutrino Yukawa matrix to exhibit a similar hierarchical pattern to that in the up-type quark Yukawa matrix. With such a hierarchy requirement, we find that leptogenesis, which would operate in a $N_2^{}$-dominated scenario with the asymmetry generated by the next-to-lightest right-handed neutrino $N_2^{}$, can greatly reduce the number of allowed textures, and disfavors the scenario that three light neutrinos are quasi-degenerate. Such a quasi-degenerate scenario of light neutrinos may soon be tested in upcoming neutrino experiments.

28 pages, 5 figures; v2: references added, minor changes, the version to appear in Phys. Rev. D; v3: references added and updated

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• Mixed Inert Scalar Triplet Dark Matter, Radiative Neutrino Masses and Leptogenesis
• Leptogenesis, radiative neutrino masses and inert Higgs triplet dark matter
• Peccei-Quinn symmetry for Dirac seesaw and leptogenesis
• Leptogenesis from the Asymmetric Texture
• Low-scale Resonant Leptogenesis in $SU(5)$ GUT with ${\mathcal{T}}_{13}$ Family Symmetry
• Seesaw model and two zero flavor neutrino texture
• Signatures of lower scale gauge coupling unification in the Standard Model due to extended Higgs sector