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

Abstract

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.

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

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• Chiral Four-Dimensional N=1 Supersymmetric Type IIA Orientifolds from Intersecting D6-Branes
• Three-Family Supersymmetric Standard-like Models from Intersecting Brane Worlds
• The Standard Model from Stable Intersecting Brane World Orbifolds
• Type I Strings with F- and B-Flux
• Standard-like models from intersecting D4-branes
• Orientifolds with branes at angles
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• Chiral supersymmetric models on an orientifold of Z_4 x Z_2 with intersecting D6-branes
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• More Supersymmetric Standard-like Models from Intersecting D6-branes on Type IIA Orientifolds
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• D-branes in Standard Model building, Gravity and Cosmology
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• Dynamical Supersymmetry Breaking in Standard-like Models with Intersecting D6-branes
• A Realistic World from Intersecting D6-Branes
• Realistic Yukawa Structures from Orientifold Compactifications
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• Realistic Yukawa Textures and SUSY Spectra from Intersecting Branes
• Probing the Green-Schwarz Mechanism at the Large Hadron Collider
• Standard-Like Model Building on Type II Orientifolds
• Flavour in Intersecting Brane Models and Bounds on the String Scale
• Anomalous U(1)s masses in non-supersymmetric open string vacua
• Flavour Changing Neutral Currents in Intersecting Brane Models
• Kahler Stabilized, Modular Invariant Heterotic String Models
• Chirality Change in String Theory
• CP Violation in Supersymmetric U(1)' Models
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• Stringy Instantons and Yukawa Couplings in MSSM-like Orientifold Models
• Type IIA Pati-Salam Flux Vacua
• SU(5) Unified Theories from Intersecting Branes
• Flipped and Unflipped SU(5) as Type IIA Flux Vacua
• Flipped SU(5) From D-branes With Type IIB Fluxes
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• Tachyon Condensation for Intersecting Branes at Small and Large Angles
• Hidden Sector Baryogenesis
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• Yukawa Coupling Structure in Intersecting D-brane Models
• Quasi-Supersymmetric $G^3$ Unification from Intersecting D6-Branes on Type IIA Orientifolds
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• Variations of the Hidden Sector in a Realistic Intersecting Brane Model
• An Inflationary Scenario in Intersecting Brane Models
• Dynamical SUSY Breaking in Intersecting Brane Models
• Supersymmetric Composite Models on Intersecting D-branes
• Collider Searches for Fermiophobic Gauge Bosons
• A Classification of Toroidal Orientifold Models
• The Search for a Realistic String Model at LHC
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• The CKM matrix from anti-SU(7) unification of GUT families
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