Examples of supersymmetric grand unified models are explicitly illustrated, in which the Higgs doublets are identified, at the tree level, with the massless degrees of freedom describing an ``accidental'' degeneracy of the vacuum at the first stage of gauge symmetry breaking. This degeneracy occurs as a consequence either of the gauge symmetry or of a discrete exact symmetry. The effect of radiative corrections, which lift the vacuum degeneracy and break the SU (2) ⊗ U (1) group, is discussed, showing that the consistency of the theory, at low energy, only sets a rather weak and mt-dependent lower bound on the lightest Higgs mass, with no constraint on the top-quark itself.
Back to the doublet - triplet splitting problem.
MORETTI, Mauro
1993
Abstract
Examples of supersymmetric grand unified models are explicitly illustrated, in which the Higgs doublets are identified, at the tree level, with the massless degrees of freedom describing an ``accidental'' degeneracy of the vacuum at the first stage of gauge symmetry breaking. This degeneracy occurs as a consequence either of the gauge symmetry or of a discrete exact symmetry. The effect of radiative corrections, which lift the vacuum degeneracy and break the SU (2) ⊗ U (1) group, is discussed, showing that the consistency of the theory, at low energy, only sets a rather weak and mt-dependent lower bound on the lightest Higgs mass, with no constraint on the top-quark itself.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
