Naturalnes in supersymmetric GUTS

Requiring the naturalness as defined by Veltman (radiative corrections should not disturb the gauge hierarchy in the Born term), supersymmetric grand unified theory based on the standard SU (5) is constructed. Supersymmetry must be unbroken above TeV energies. Renormalization-group analysis gives sin2θW(MW) and αc in agreement with experimental values. The unification massMGUT is larger than the standard model and hence proton lives longer.

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