A new minimal neutrino mass matrix texture is introduced that enforces equal Majorana phases within a partial TBM scheme and is realized via hybrid Type-I and Type-II seesaw under an extended discrete symmetry.
Mu-tau symmetry and the Littlest Seesaw
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abstract
Motivated by the latest neutrino oscillation data which is consistent with maximal atmospheric mixing and maximal leptonic CP violation, we review various results in $\mu\tau$ symmetry, then include several new observations and clarifications, including identifying a new general form of neutrino mass matrix with $\mu\tau$ symmetry. We then apply the new results to the neutrino mass matrix associated with the Littlest Seesaw model, and show that it approximately satisfies the new general form with $\mu\tau$ symmetry, and that this is responsible for its approximate predictions of maximal atmospheric mixing and maximal CP violation in the lepton sector.
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A new neutrino mass matrix texture under A4 x multiple Z symmetries predicts normal hierarchy, theta23 octant, and bounds on phases and masses in a seesaw model.
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Equal Majorana Phases from a Minimal and Predictive Neutrino Texture
A new minimal neutrino mass matrix texture is introduced that enforces equal Majorana phases within a partial TBM scheme and is realized via hybrid Type-I and Type-II seesaw under an extended discrete symmetry.
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The Triadic Texture: Neutrino Predictions, Viable Vacuum, and Phenomenological Constraints
A new neutrino mass matrix texture under A4 x multiple Z symmetries predicts normal hierarchy, theta23 octant, and bounds on phases and masses in a seesaw model.