Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-15
Phys.Lett.B697:343-350,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
Accepted for publication in Physics Letters B
Scientific paper
10.1016/j.physletb.2011.02.022
We construct a four-generation MSSM with rank-4 Yukawa matrices from intersecting D6 branes on a T^6/(Z_2 x Z_2) orientifold. The Yukawa matrices obtained provide an example of Flavor Democracy (FD), where the Yukawa couplings are all nearly equal. Mass hierarchies may then be generated by slight perturbations away from FD. We find that it is possible to obtain hierarchical masses for the quarks and leptons of each generation and mixings between them. In addition, the tree-level gauge couplings are unified at the string scale. Finally, we also construct similar models with one, two, and three generations in which the rank of the Yukawa matrices is equal to the number of generations in each model.
Belitsky Andrei V.
Lebed Richard F.
Mayes Van E.
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