Radiative corrections of sin/sup 2/ thetas /sub W//sup exp/ in the SU(5) model

The authors compute perturbatively in the SU(5) grand unification theory the radiative corrections to sin/sup 2/ thetas /sub W/ /sup 0/ through a phenomenological weak mixing angle, sin/sup 2 / thetas /sub W//sup exp/(/b q//sup 2/), defined in the nu /sub mu //b e/ elastic scattering. They essentially recover the results obtained by using the renormalization group analysis.