Least supersymmetric standard model

We propose the minimal (least) version of the supersymmetric standard model which can solve the hierarchy problem in the same way as the so-called minimal supersymmetric standard model and presents solutions to some of its problems. Supersymmetry is broken in a secluded sector and mediated to the observable sector by messengers of a gauge group G under which the first two generations transform. The group G spontaneously breaks (almost) supersymmetrically at a scale at most a few orders of magnitude below the scale of gauge messengers M *∼1015GeV. By gauge mediation, sfermions of the first two generations acquire supersymmetry breaking masses m^∼10TeV. Supersymmetry breaking is also mediated by gravity which generates masses for all sfermions, Higgsinos, and gauginos at the TeV scale and can provide appropriate values to the μ and B μ parameters by D-term effective operators. If gravity mediation is minimal flavor violating there is no supersymmetric flavor problem. In the presence of R-parity dark matter can be the lightest neutralino, as in the minimal supersymmetric standard model, and the LHC model phenomenology is characterized by the fact that only third-generation squarks and sleptons are present. © 2012 American Physical Society.