Renormalization effects are analyzed for a class of supersymmetric grand unified theories which contain the standard SU(3)c×SU(2)L×U(1) model. Predictions for sin²^θW(mW) and the proton lifetime are obtained as functions of Λ_-MS (-MS is the modified minimal-subtraction scheme), NH (number of relatively light Higgs doublets), and μ (the scale of supersymmetry breaking). For realistic input parameters we find 0.23<~sin²^θW(mW)<~0.26 and 10³⁸τₚ10²⁹ yr. Loop effects that could render the larger predicted values of sin²^θW(mW) consistent with experiment are described.
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Marciano et al. (1982) studied this question.
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