Uncertainties in Coupling Constant Unification

Details Uncertainties in Coupling Constant Unification Uncertainties in Coupling Constant Unification

1992-10-14

arxiv.org/abs/hep-ph/9210235v1

Phys.Rev. D47 (1993) 4028-4045

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTex, 51 pages, 6 figures (available upon request), UPR-0513T

Scientific paper

10.1103/PhysRevD.47.4028

The status of coupling constant unification in the standard model and its supersymmetric extension are discussed. Uncertainties associated with the input coupling constants, $m_{t}$, threshold corrections at the low and high scales, and possible nonrenormalizable operators are parametrized and estimated. A simple parametrization of a general supersymmetric new particle spectrum is given. It is shown that an effective scale $M_{SUSY}$ can be defined, but for a realistic spectrum it may differ considerably from the typical new particle masses. The implications of the lower (higher) values of $\alpha_{s}(M_{Z})$ suggested by low-energy ($Z$-pole) experiments are discussed.

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