Dynamical GUT breaking and μ-term driven supersymmetry breaking

Models for dynamical breaking of supersymmetric grand unified theories are presented. The doublet-triplet splitting problem is absent since the Higgs-doublet superfields can be identified with the massless mesons of the strong gauge group whereas there are no massless states corresponding to the colored-Higgs fields. Various strong gauge groups SU(N-c), Sp(N-c), and SO(N-c) are examined. In a model with SO(9) strong gauge group, adding a mu-term for the Higgs fields triggers to break supersymmetry in a metastable vacuum. The pattern of the supersymmetry breaking parameters is predicted to be of the gauge-mediation type with modifications in the Higgs sector.