Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-07-26
Prog.Theor.Phys. 106 (2001) 1275-1295
Physics
High Energy Physics
High Energy Physics - Phenomenology
28pages, Latex, no figures, Revised version includes some details
Scientific paper
10.1143/PTP.106.1275
In the four-dimensional effective theory from string compactification discrete flavor symmetries arise from symmetric structure of the compactified space and generally contain both the $R$ symmetry and non-$R$ symmetry. We point out that a new type of non-Abelian flavor symmetry can also appear if the compact space is non- commutative. Introducing the dihedral group $D_4$ as such a new type of flavor symmetry together with the $R$ symmetry and non-$R$ symmetry in $SU(6) \times SU(2)_R$ model, we explain not only fermion mass hierarchies but also hierarchical energy scales including the breaking scale of the GUT-type gauge symmetry, intermediate Majorana masses of R-handed neutrinos and the scale of $\mu$-term.
Abe Yasuhiro
Hattori Chuichiro
Ito Makoto
Matsuda Makoto
Matsunaga Mamoru
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