Composite quarks and leptons in higher space-time dimensions

Abstract

A new approach towards the composite structure of quarks and leptons in the context of the higher dimensional unified theories is proposed. Owing to the certain strong dynamics, much like an ordinary QCD, every possible vectorlike multiplets of composites appear in higher dimensional bulk space-time, however, through a proper Sherk-Schwarz compactification only chiral set of composite quarks and leptons survive as the massless states in four dimensions. In this scenario restrictions related with the 't Hooft's anomaly matching condition are turned out to be avoided and, as a result, the composite models look rather simple and economic. We demonstrate our approach by an explicit construction of model of preons and their composites unified in the supersymmetric SU(5) GUT in five space-time dimensions. The model predicts exactly three families of the composite quarks and leptons being the triplets of the chiral horizontal symmetry SU(3)_h which automatically appears in the composite spectrum when going to ordinary four dimensions.

13 pages, tcilatex, no figures, v2 - misprints corrected

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• Gauge Unification in Higher Dimensions
• SU(5) Grand Unification in Extra Dimensions and Proton Decay
• Higher dimensional supersymmetry in 4D superspace
• Supersymmetric theories with compact extra dimensions in N=1 superfields
• Gauge Unification In Six Dimensions
• Split Multiplets, Coupling Unification and Extra Dimension
• SO(10) Unified Theories in Six Dimensions
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• Generalized symmetry breaking on orbifolds
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• GUT Breaking on $M^4\times T^2/(Z_2\times Z_2^{\prime })$
• GUT Breaking on the Lattice
• Doublet-Triplet Splitting and Fat Branes
• TeV scale unification in four dimensions versus extra dimensions
• Geometric CP Violation with Extra Dimensions
• Supersymmetry breaking in 5-dimensional space-time with S**1/Z(2) compactification

Cited by in corpus (9)

• Orbifold Family Unification
• E6 inspired composite Higgs model
• SU(4)_c x SU(2)_L x SU(2)_R model from 5D SUSY SU(4)_c x SU(4)_{L+R}
• Preon Model and Family Replicated E_6 Unification
• Are Preons Dyons? Naturalness of Three Generations
• Three family unification in higher dimensional models
• A Preon Model Based Universe
• Composite Leptons and Quarks from Hexad Preons
• Dyons near the Planck scale