Fermion Mass Hierarchy and Supersymmetry Breaking in 6D SO(10) GUT on   Orbifold
  We suggest simple models which produce the suitable fermion mass hierarchies and flavor mixing angles based on the 6 dimensional N=1 supersymmetric SO(10) grand unified theory compactified on a $T^2/(Z_2 \times Z_2')$ orbifold. We introduce extra vector-like heavy fields in the extra dimensions, and the suitable fermion mass hierarchies and flavor mixings are generated by integrating out these heavy fields. We consider gaugino mediation and gauge mediation supersymmetry breaking mechanisms and their flavor structures. The experimental constraints of small flavor changing neutral currents suggest where to locate the supersymmetry breaking brane in the gaugino mediation mechanism. On the other hand, the SUSY breaking masses are highly degenerated in the gauge mediation scenario, where the flavor changing neutral currents are naturally suppressed as in the ordinal four dimensional gauge mediation models. 
Naoyuki Haba, Yasuhiro Shimizu