A Model of Lepton Masses from a Warped Extra Dimension

By C. Csáki, Cédric Delaunay, Christophe Grojean, Y. Grossman. 2008

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In order to explain the non-hierarchical neutrino mixing angles and the absence of lepton flavor violating processes in the context of warped extra dimensions one needs to introduce bulk flavor symmetries. We present a simple model of lepton masses and mixings in RS models based on the A4 non-abelian discrete symmetry. The virtues of this choice are: (i) the natural appearance of the tri-bimaximal mixing pattern; (ii) the complete absence of tree-level flavor violations in the neutral sector; (iii) the absence of flavor gauge bosons; (iv) the hierarchies in the charged lepton masses are explained via wave-function overlaps. We present the minimal field content and symmetry breaking pattern necessary to obtain a successful model of this type. The bounds from electroweak precision measurements allow the KK mass scale to be as low as ∼ 3TeV. Tree-level lepton flavor violation is absent in this model, while the loop induced � → eγ branching fraction is safely below the experimental bound.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3269209ad5d9c41e0bd0502c5f69b41ce97e5584

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In Nuclear and High Energy Physics

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