Abstract
The mechanism for generating radiative breaking of the gauge symmetry at an intermediate mass scale is analyzed in E 6 superstring-inspired models. Such a breaking can be induced by large vacuum expectation values, which are developed along a flat direction of the scalar potential. Radiative one-loop corrections as well as possible contributions from non-renormalizable terms are taken into account. The minimization of the effective potential is carried out quantitatively in a specific model based on the gauge group SU(3) c ×SU(2) L×[U(1)] 3. A numerical analysis is performed in order to establish the compatibility between the values obtained for M I (in the range 10 7−10 14 GeV) and those of the low-energy parameters (sin 2 θ w, α 3, and α em). The characteristic features of the example considered here are believed to remain valid in more general situations.
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