Less minimal supersymmetric standard model

Most of the phenomenological studies of supersymmetry have been carried out using the so-called minimal supergravity scenario, where one assumes a universal scalar mass, gaugino mass, and trilinear coupling at MGUT. Even though this is a useful simplifying assumption, it is too restrictive to accommodate a large variety of phenomenological possibilities. It predicts that the lightest supersymmetric particle (LSP) is an almost pure B-ino. We extend the minimal scenario by introducing one extra parameter: the Fayet-Iliopoulos D term for U(1)Y, DY, and find a much more diverse phenomenology, where the LSP is ̃ \~ν_τ, ̃ \~τ or a Higgsino-like neutralino. We discuss the relevance of the different possibilities to collider signatures.