A Three-Family Standard-like Orientifold Model: Yukawa Couplings and Hierarchy

Details A Three-Family Standard-like Orientifold Model: Yukawa Couplings and Hierarchy A Three-Family Standard-like Orientifold Model: Yukawa Couplings and Hierarchy

2002-06-13

arxiv.org/abs/hep-th/0206115v3

Nucl.Phys.B642:139-156,2002

Physics

High Energy Physics

High Energy Physics - Theory

19 pages, 6 figures, 5 tables. Final published version, Nucl.Phys.B642:139-156,2002, including additional discussion

Scientific paper

10.1016/S0550-3213(02)00684-3

We discuss the hierarchy of Yukawa couplings in a supersymmetric three family Standard-like string Model. The model is constructed by compactifying Type IIA string theory on a Z_2 x Z_2 orientifold in which the Standard Model matter fields arise from intersecting D6-branes. When lifted to M theory, the model amounts to compactification of M-theory on a G_2 manifold. While the actual fermion masses depend on the vacuum expectation values of the multiple Higgs fields in the model, we calculate the leading worldsheet instanton contributions to the Yukawa couplings and examine the implications of the Yukawa hierarchy.

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