Parameters S, T,and U of radiative corrections and masses of scalar leptoquarks in the minimal model featuring four-color symmetry

The contributions to the parameters S, T, and U of radiative corrections ar e discussed within the minimal model featuring four-color symmetry of the P ati-Salam type. A numerical analysis of these contributions is given for th e Higgs mechanism of mass generation for scalar leptoquarks and the simples t version of scalar-leptoquark mixing. It is shown that up-to-date experime ntal data on S, T, and U are compatible with the existence of relatively li ght scalar leptoquarks (of masses about 1 TeV or below), still lighter scal ar leptoquarks (of masses below 1 TeV) improving the agreement of theoretic al results with experimental data on S, T, and U. (C) 2001 MAIK "Nauka/Inte rperiodica".