Grand unification threshold effects in supersymmetric SU(5) models

K. Hagiwara, Yoichi Yamada

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We study low energy consequences of the heavy particle mass spectrum in two specific supersymmetric SU(5) models, the minimal model and the missing doublet model with natural doublet-triplet splitting. The grand unification threshold effects are found to be significant and strongly model dependent: The minimal model favors a high supersymmetry threshold (ΛSUSY>1 TeV) for αs(mZ)MS̄=0.113±0.004 (MS̄ denotes the modified minimal subtraction scheme), whereas the missing doublet model favors a low threshold (ΛSUSY<9 TeV). The X-boson-mediated proton decay lifetime can be shortened by more than one order of magnitude in both models.

Original languageEnglish
Pages (from-to)709-712
Number of pages4
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 1993 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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