A model of lepton masses from a warped extra dimension

作者：Csaki Csaba; Delaunay Cedric; Grojean Christophe; Grossman Yuval

来源：Journal of High Energy Physics, 2008, (10): 055.

DOI：10.1088/1126-6708/2008/10/055

• Beyond Standard Model
• Neutrino Physics
• Field Theories in Higher Dimensions
• Rare Decays

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 A(4) 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 similar to 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.

• 出版日期2008-10
• 单位中国科学院理论物理研究所; 中国地震局