Making ends meet: String unification and low-energy data

Journal Article · Mon Oct 02 04:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.2646· OSTI ID:118578

Dienes, K R; Faraggi, A E ^[1]

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1. School of Natural Sciences, Institute for Advanced Study, Olden Lane, Princeton, New Jersey 08540 (United States)

We examine the effects that may resolve the disagreement between string-scale unification and low-energy data. These include string threshold corrections, nonstandard hypercharge normalizations, light supersymmetric thresholds, intermediate gauge structure, and extra matter beyond the minimal supersymmetric standard model. We explicitly evaluate these effects within the flipped SU(5), SO(6){times}SO(4), and various SU(3){times}SU(2){times}U(1) string models, and surprisingly find that the only way to reconcile string unification with low-energy data is through certain types of extra matter. Remarkably, many of the realistic string models contain precisely this required matter in their massless spectra.

• Research Organization: Institute for Advanced Study
• DOE Contract Number: FG02-90ER40542
• OSTI ID: 118578
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 14 Vol. 75; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CORRECTIONS
HYPERCHARGE
MASS SPECTRA
SO-4 GROUPS
SO-6 GROUPS
STANDARD MODEL
STRING MODELS
SU-2 GROUPS
SU-3 GROUPS
SU-5 GROUPS
SUPERSYMMETRY
U-1 GROUPS