Supersymmetry and Light Quark Masses in a Realistic Superstring Model

Abstract

We examine the light quark masses in a standard--like superstring model in the four dimensional free fermionic formulation. We find that the supersymmetry constraints in the observable and hidden sectors eliminate all large contributions to $m_u$ and $m_d$ and force them to be much smaller than the other quark masses. The requirement for an acceptable Higgs doublet spectrum results in $m_u<<m_d$. In these models a realistic $m_d$ can always be obtained whereas $m_u$ is at most $10^{-5}MeV$. For particular choices of flat directions or vacua $m_u$ can be as small as $10^{-7}MeV$ but cannot vanish.

WIS-93/98/OCT-PH, 22 pages and 2 tables, uses phyzzx.tex and tables.tex

References in corpus (9)

• 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--Kobayashi--Maskawa Mixing in Superstring Derived Standard--like Models
• Neutrino Masses in Superstring Derived Standard--like Models
• Cabibbo Mixing in Superstring Derived Standard--like Models
• TeV Scale Leptoquarks as a Signature of Standard--like Superstring Models
• Can the Axions of Standard--like Superstring Models Solve the Strong CP Problem?
• CKM Matrix from Leptoquark-Quark Mixing in a String Model