Unification predictions

Abstract

The unification of gauge couplings suggests that there is an underlying (supersymmetric) unification of the strong, electromagnetic and weak interactions. The prediction of the unification scale may be the first quantitative indication that this unification may extend to unification with gravity. We make a precise determination of these predictions for a class of models which extend the multiplet structure of the Minimal Supersymmetric Standard Model to include the heavy states expected in many Grand Unified and/or superstring theories. We show that there is a strong cancellation between the 2-loop and threshold effects. As a result the net effect is smaller than previously thought, giving a small increase in both the unification scale and the value of the strong coupling at low energies.

20 pages, Latex, 5 Postscipt figures; 2 references added

Cited by in corpus (28)

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• Enhancement of Proton Decay Rates in Supersymmetric SU(5) Grand Unified Models
• Testing SUSY
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• The effect of Yukawa couplings on Unification Predictions and the non-perturbative limit
• Disrupting the one-loop renormalization group invariant M/alpha in supersymmetry
• Generic Gravitational Corrections to Gauge Couplings in SUSY SU(5) GUTs
• Flat directions, String Compactification and 3 Generation Models
• Flavour Violation in SUSY SU(5) GUT at Large tan beta
• Gauge Coupling Unification in MSSM + 5 Flavors
• Three-loop $\beta$-functions and two-loop anomalous dimensions for MSSM regularized by higher covariant derivatives in an arbitrary supersymmetric subtraction scheme
• Precision Gauge Unification from Extra Yukawa Couplings
• Soft Masses in Strong Unification
• Threshold Corrections to Baryon Number Violating Operators in Supersymmetric SU(5) GUTs
• Suppressing dimension-5 operators in general SU(5) models
• Relaxing b\to sγConstraints on the Supersymmetric Particle Mass Spectrum
• Flavour Democracy in Strong Unification
• Bounds on supersymmetric effective operators from heavy diphoton searches
• A note on the RG flow in (N=1, D=4) Supergravity and applications to Z_3 orbifold/orientifold compactification
• A note on two-loop effects in the DMSSM
• Prediction for ${\alpha }_3(M_z)$ in a string-inspired model
• Light Stops, Heavy Higgs, and Heavy Gluinos in Supersymmetric Standard Models with Extra Matters
• The Electroweak Symmetry Breaking Riddle