The weak mixing angle and unification mass in supersymmetric SU(5)
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Abstract
We consider the predictions for the weak mixing angle [theta]W and the scale M of unification in a supersymmetric extension of SU(5), with particular emphasis on the sensitivity to the number of Higgs multiplets. In the one-loop approximation, we also calculate the ratio mb/m[tau]. We discuss generally the effects of an intermediate threshold between the weak interaction scale and M and estimate the sensitivity of [theta]W and M to the scale of supersymmetry breaking.The evolution of the coupling constants of the supersymmetric SU(3) [circle times operator] SU(2) [circle times operator] U(1) effective gauge theory is described and the two-loop corrections to [theta]W and M are calculated.