Electric Charge Quantization and Extra Dimensions
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In models with flat extra dimensions tiny Dirac neutrino masses can be generated via the coupling of four dimensional Standard Model fields to a higher dimensional fermion. Here we argue that, in spite of the Dirac nature of the neutrino, quantization of the electric charge can still be understood as a result of anomaly cancellation, charge conservation and naturalness requirements.
9 pages. Several changes: Discusion on RS models removed, Comments added
9 pages. Several changes: Discusion on RS models removed, Comments added