Abstract
We discuss the phenomenological consequences of implementing intermediate-mass scales inE6 superstring-inspired models. Starting from a suitable Calabi-Yau compactification withb1,1>1, one gets, after Hosotani breaking, the rankr=5 gauge groupSU(3)c×SU(2)L×U(1)Y×U(1)E, that is broken at an intermediate-mass scale down to the standard-model group. The analysis of both the intermediate and the electroweak breaking is performed in the two cases Λc=Mx and Λc<Mz, where λc is the scale at which the hidden sector gauginos condensate. We perform quantitatively the minimization of the low-energy effective potential and the renormalization group analysis, yielding a viable set of mass spectra and confirming the reliability of the intermediate-breaking scheme.
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