Large Mixing Induced by the Strong Coupling with a Single Bulk Neutrinos

Abstract

Neutrino is a good probe of extra dimensions. Large mixing and the apparent lack of very complicated oscillation patterns may be an indication of large couplings between the brane and a single bulk neutrino. A simple and realistic five-dimensional model of this kind is discussed. It requires a sterile in addition to three active neutrinos on the brane, all coupled strongly to one common bulk neutrino, but not directly among themselves. Mindful that sterile neutrinos are disfavored in the atmospheric and solar data, we demand induced mixing to occur among the active neutrinos, but not between the active and the sterile. The size $R$ of the extra dimension is arbitrary in this model, otherwise it contains six parameters which can be used to fit the three neutrino masses and the three mixing angles. However, in the model those six parameters must be suitably ordered, so a successful fit is not guaranteed. It turns out that not only the data can be fitted, but as a result of the ordering, a natural connection between the smallness of the reactor angle ${\theta }_{13}$ and the smallness of the mass-gap ratio $\Delta M_{solar}^2/\Delta M_{atmospheric}^2$ can be derived.

Misprints above eq. (22) corrected. To appear in PRD

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• MSLED, Neutrino Oscillations and the Cosmological Constant
• A scheme with two large extra dimensions confronted with neutrino physics
• Higher dimensional models of light Majorana neutrinos confronted by data
• Dirac Vs. Majorana Neutrino Masses From a TeV Interval
• A Hybrid Model of Neutrino Masses and Oscillations: Bulk Neutrinos in the Split-Fermion Scenario
• Invisible decays of Higgs and other mesons in models with singlet neutrinos in large extra dimensions
• Family Symmetry and Single Right-Handed Neutrino Dominance in Five Dimensions
• The Absorptive Extra Dimensions
• Singlet fermions on curved extra dimension tori