Radiative quark and lepton masses through soft supersymmetry breaking

A supersymmetric extension of the standard strong and electroweak gauge model has the property that light quarks and leptons acquire radiative masses as the result of the breaking of a chiral symmetry by soft supersymmetry-breaking terms. This radiative mechanism is then extended to include all known quarks and leptons in the context of a supersymmetric SU(3)×SU(2)×U(1)×U(1)’ gauge model based on ${\mathrm{E}}_6$ particle content as the possible low-energy limit of a superstring theory.