Minimal supersymmetric Pati-Salam theory: Determination of physical scales

We systematically study the minimal supersymmetric Pati-Salam theory, paying special attention to the unification constraints. We find that the SU(4)_c scale M_c and the left-right scale M_R lie in the range 10¹⁰ GeV<M_c<10¹⁴ GeV, 10³ GeV<M_R<10¹⁰ GeV (with single-step breaking at 10¹⁰ GeV), giving a potentially accessible scale of parity breaking. The theory includes the possibility of having doubly charged supermultiplets at the supersymmetry breaking scale, color octet states with a mass ∼M²_R/M_c, magnetic monopoles of intermediate mass that do not conflict with cosmology, and a “clean” (type I) form for the seesaw mechanism of the neutrino mass.