LARGE RADIATIVE-CORRECTIONS TO LOWEST-ORDER PROCESSES IN THE STANDARDMODEL

A scheme for calculating logarithmically large radiative corrections t o Born cross sections of processes at high energies is developed withi n the framework of the Standard Model. Radiative corrections to the to tal and differential cross sections are found to be large for the e+e- --> W+W-, ZZ, and gammaZ processes, whereas they are absent in the ga mmagamma-collisions. This is associated with nonmonochromatism of e(+/ -)-beams in lepton colliders with energies above square-root s > 500 G eV. This nonmonochromatism is similar to the nonmonochromatism of phot on beams produced by laser conversion.