Comment On ``Grand Unification and Supersymmetric Threshold"

Details Comment On ``Grand Unification and Supersymmetric Threshold" Comment On ``Grand Unification and Supersymmetric Threshold"

1992-06-19

arxiv.org/abs/hep-ph/9206238v3

Phys.Rev. D47 (1993) 5018-5020

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages (revised)

Scientific paper

10.1103/PhysRevD.47.5018

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.

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