Z'-mediated Supersymmetry Breaking

TL;DR

This paper explores models where supersymmetry breaking is mediated by a U'(1) gauge interaction, resulting in a split spectrum with heavy sfermions and light gauginos, and discusses their phenomenological implications.

Contribution

It introduces a class of models with U'(1)-mediated supersymmetry breaking, providing specific charge assignments, benchmark models, and phenomenological analysis.

Findings

Heavy sfermions and Higgsinos with light gauginos and Higgs (~140 GeV)

Implications for dark matter, gluino lifetime, and neutrino masses

Five benchmark models illustrating the spectrum and phenomenology

Abstract

We consider a class of models in which supersymmetry breaking is communicated dominantly via a U'(1) gauge interaction, which also helps solve the \mu problem. Such models can emerge naturally in top-down constructions and are a version of split supersymmetry. The spectrum contains heavy sfermions, Higgsinos, exotics, and Z' ~ 10-100 TeV; light gauginos ~ 100-1000 GeV; a light Higgs ~ 140 GeV; and a light singlino. A specific set of U'(1) charges and exotics is analyzed, and we present five benchmark models. Implications for the gluino lifetime, cold dark matter, and the gravitino and neutrino masses are discussed.