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.
ASJC Scopus subject areas
- Physics and Astronomy(all)