Gauge Coupling Unification in Superstring Derived Standard--like Models

Details Gauge Coupling Unification in Superstring Derived Standard--like Models Gauge Coupling Unification in Superstring Derived Standard--like Models

1993-01-25

arxiv.org/abs/hep-ph/9301268v1

Phys.Lett. B302 (1993) 202-208

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1016/0370-2693(93)90385-U

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.

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