Making ends meet: String unification and low-energy data

Keith R. Dienes, Alon E. Faraggi

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

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)×SO(4), and various SU(3)×SU(2)×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.

Original languageEnglish (US)
Pages (from-to)2646-2649
Number of pages4
JournalPhysical review letters
Volume75
Issue number14
DOIs
StatePublished - Jan 1 1995
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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