Radiative corrections to sin/sup 2/ thetas

The authors define an effect weak mixing angle-process independent-from the diagonalization of the photon and /b Z/ vector boson inverse propagator matrix, including one-loop corrections. An explicit computation of these corrections in the /b SU//sub 2,L/*/b U//sub 1/ model and in the /b SU//sub 5/ grand unified theory is presented. They compare their results with related works.