Comment On ``Grand Unification and Supersymmetric Threshold"

Abstract

Barbieri and Hall have argued that threshold effects at the scale of grand-unification wipe out predictions on the SUSY scale, M_S. Using triviality arguments we give upper bounds on ultraheavy particles, while proton stability gives lower bounds on the mass of the higgs color-triplet. We find no useful lower bound on the $\Sigma$ supermultiplet, but if the strong coupling constant is as large as recent experiments suggest, unification in the minimal SUSY SU(5) model requires that the $Sigma$ masses be $\sim 10^{-7}{M}_V$ and that the color octet and weak triplet be split in mass by a factor of $\sim$100.

6 pages (revised)

Cited by in corpus (7)

• Study of Constrained Minimal Supersymmetry
• The Supersymmetric Particle Spectrum
• Renormalization Group Study of the Standard Model and its Extensions: II. the Minimal Supersymmetric Standard Model
• Planck Scale Physics and the Testability of SU(5) Supergravity GUT
• Generic Gravitational Corrections to Gauge Couplings in SUSY SU(5) GUTs
• Status of the superworld: from theory to experiment
• Supersymmetric Model of Neutrino Mass and Leptogenesis with String-Scale Unification