A texture-zero seesaw model allows large lepton-number violation together with naturally small neutrino masses by protecting the light neutrino with an accidental symmetry.
Precision tests of unitarity in leptonic mixing
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abstract
In the light of the recent LHC data, we study precision tests sensitive to the violation of lepton universality, in particular the violation of unitarity in neutrino mixing. Keeping all data we find no satisfatory fit, even allowing for violations of unitarity in neutrino mixing. Leaving out sin$^2 \theta_{\scriptsize \mbox{eff}}$ from the hadronic forward-backward asymmetry at LEP, we find a good fit to the data with some evidence of lepton universality violation at the $\mathcal{O}(10^{-3})$ level.
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Archimedean Seesaw: Small Neutrino Masses and Large Lepton-number Violation
A texture-zero seesaw model allows large lepton-number violation together with naturally small neutrino masses by protecting the light neutrino with an accidental symmetry.