Singlet Extensions of the MSSM with Z4R Symmetry

Abstract

We discuss singlet extensions of the MSSM with Z4R symmetry. We show that holomorphic zeros can avoid a potentially large coefficient of the term linear in the singlet. The emerging model has both an effective μ term and a supersymmetric mass term for the singlet μN which are controlled by the gravitino mass. The μ term turns out to be suppressed against μN by about one or two orders of magnitude. We argue that this class of models might provide us with a solution to the little hierarchy problem of the MSSM.