Light Fermion Masses in Superstring Derived Standard--like Models

Abstract

I discuss the suppression of the lightest generation fermion mass terms in realistic superstring standard--like models in the free fermionic formulation. The suppression of the mass terms is a consequence of horizontal symmetries that arise due to the $Z_2\times Z_2$ orbifold compactification. In a specific model I investigate the possibility of resolving the strong CP puzzle by a highly suppressed up quark mass. In some scenarios the up quark mass may be as small as $10^{-8}MeV$. I show that in the specific model the suppression of the up quark mass is incompatible with the requirement of a nonvanishing electron mass. I discuss how this situation may be remedied.

IASSNS-93/82, 16 pages, uses phyzzx

References in corpus (5)

• Construction of Realistic Standard--like Models in the Free Fermionic Superstring Formulation
• Aspects of Nonrenormalizable Terms in a Superstring Derived Standard--like Model
• Generation Mass Hierarchy in Superstring Derived Models
• Gauge Coupling Unification in Superstring Derived Standard--like Models
• Cabibbo Mixing in Superstring Derived Standard--like Models

Cited by in corpus (8)

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• String Model Building in the Age of D-Branes
• Free Fermionic Constructions of Heterotic Strings
• CKM Matrix from Leptoquark-Quark Mixing in a String Model
• $Z^{\prime }$s and sterile neutrinos from heterotic string models: exploring $Z^{\prime }$ mass exclusion limits