Gauge Coupling Unification in Superstring Derived Standard--like Models

Abstract

I discuss gauge coupling unification in a class of superstring standard--like models, which are derived in the free fermionic formulation. Recent calculations indicate that the superstring unification scale is at $O(10^{18}GeV)$ while the minimal supersymmetric standard model is consistent with LEP data if the unification scale is at $O(10^{16})GeV$. A generic feature of the superstring standard--like models is the appearance of extra color triplets $(D,\bar{D})$, and electroweak doublets $(\ell ,\bar{\ell })$, in vector--like representations, beyond the minimal supersymmetric standard model. I show that gauge coupling unification at $O(10^{18}GeV)$ in the superstring standard--like models can be consistent with LEP data. I present an explicit standard--like model that can realize superstring gauge coupling unification.

WIS--92/17/FEB--PH, 12 pages

References in corpus (2)

• Construction of Realistic Standard--like Models in the Free Fermionic Superstring Formulation
• Gauge Coupling Running in Minimal SU(3)xSU(2)xU(1) Superstring Unification

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