Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-06-02
JHEP 0810:055,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
Scientific paper
10.1088/1126-6708/2008/10/055
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 3 TeV. Tree-level lepton flavor violation is absent in this model, while the loop induced mu -> e gamma branching fraction is safely below the experimental bound.
Csa'ki Csaba
Delaunay Cedric
Grojean Christophe
Grossman Yuval
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