An Exceptional SSM from E6 Orbifold GUTs with intermediate LR symmetry

Abstract

We propose a class of E6-based local orbifold Grand Unified Theories (GUTs) which yield an exceptional supersymmetric standard model as their low energy theory including leptoquark and unhiggs exotics and a Z' at the TeV scale. Unification is achieved in two steps through an intermediate scale symmetry breaking.

Comments: Minor typos corrected, and extended conclusions a bit