Superheavy spectrum and supersymmetric grand unification

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.47.5018· OSTI ID:6583634

Faraggi, A E ^[1]; Grinstein, B; Meshkov, S ^[2]

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1. Department of Physics, Weizmann Institute of Science, Rehovot 76100 (Israel)
2. Superconducting Super Collider Laboratory, 2550 Beckleymeade Avenue, Dallas, Texas 75237 (United States)

We examine in detail the effect of the superheavy particle spectrum on the claim that recent data from CERN LEP are consistent with a SUSY SU(5) grand unified theory (GUT) whose superparticle spectrum is characterized by a single scale [ital M][sub [ital S]] of approximately 1 TeV, and has three couplings unifying at a scale [mu]=[ital M][sub [ital V]]. Using the most recent LEP determination of [alpha][sub [ital s]], 0.125[plus minus]0.005, we find that SUSY unification requires that [ital M][sub [ital S]][lt]100 GeV. Larger values of [ital M][sub [ital S]] can be accommodated by assuming that [Sigma], a multiplet transforming as the adjoint of SU(5), has a mass 8 to 12 orders of magnitude below the GUT scale, with the GUT scale close to or even above the Planck scale. Larger values of [alpha][sub [ital s]], with unification below the Planck scale, may be accommodated only by breaking the degeneracy of the color octet and weak triplets of the [Sigma] multiplet, but this splitting appears in SUSY SU(5) GUT's only as a gravitational effect in the form of nonrenormalizable operators.

• DOE Contract Number: AC35-89ER40486
• OSTI ID: 6583634
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 47:11; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

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