  Compared to the minimal supersymmetric standard model, an extension by
vectorlike fermions is able to explain the Higgs mass while retains the grand
unification. We investigate the minimal vectorlike model by focusing on the
vectorlike electroweak sector. We firstly derive the mass spectrum in the
electroweak sector, then calculate the one-loop effects on the Higgs physics,
and finally explore either vectorlike or neutralino dark matter. Collider
constraints are briefly discussed.

High Energy Physics - Phenomenology;High Energy Physics - Experiment