Z'-mediated Supersymmetry Breaking

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  • 8 October 2007
Abstract
We consider a class of models in which supersymmetry breaking is communicated dominantly via a U(1)' gauge interaction. We also require that the U(1)' plays a crucial role in solving the mu problem. Such constructions can be realized fairly naturally and are quite frequent in top-down constructions. The low energy spectrum generically contains heavy sfermions, Higgsinos, exotics, and Z' (~ 10-100 TeV); light gauginos ~ 100-1000 GeV, of which the lightest can be wino-like; and a light Higgs in the range 140-180 GeV. Typically, the singlino is also light and may give interesting signals at the LHC. Such models can be viewed as a specific realization of a modest version of split supersymmetry. A specific set of U(1)' charges and exotics which illustrate these features is analyzed in detail, and we present five benchmark models. Implications for the gluino lifetime, cold dark matter, the gravitino mass, and neutrino masses are discussed.

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