Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1997-07-20
Nucl.Phys.B511:3-24,1998
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, Latex, 5 Postscipt figures; 2 references added
Scientific paper
10.1016/S0550-3213(97)00664-0
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.
Ghilencea Dumitru
Lanzagorta Marco
Ross Graham G.
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