Supersymmetry and an extra vectorlike generation

Within the framework of supersymmetry, the particle content is extended in a way that each Higgs doublet is in a full generation. Namely, in addition to ordinary three generations, there is an extra vectorlike generation, and it is the extra slepton SU(2)(L) doublets that are taken to be the two Higgs doublets. R-parity violating interactions contain ordinary Yukawa interactions. Breaking of supersymmetry and gauge symmetry are analyzed. Fermion and boson spectra are calculated. Phenomenological constraints and relevant new physics at Large Hadron Collider are discussed.