title: Gauge coupling unification and light exotica in string theory.
abstract: In this Letter we consider the consequences for the CERN Large Hadron Collider of light vectorlike exotica with fractional electric charge. It is shown that such states are found in orbifold constructions of the heterotic string. Moreover, these exotica are consistent with gauge coupling unification at one loop, even though they do not come in complete multiplets of SU(5).
authors.affiliation: Department of Physics, The Ohio State University, 191 W. Woodruff Ave., Columbus, Ohio 43210, USA.
authors.forename: Stuart
authors.initials: S
authors.lastname: Raby
authors.forename: Akin
authors.initials: A
authors.lastname: Wingerter