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The possibility that the gluino is the next to the lightest supersymmetricparticle (NLSP) is discussed and it is shown that this situation arises innonuniversal SUGRA models within a significant part of the parameter spacecompatible with all known experimental bounds. It is then shown that the gluinoNLSP (GNLSP) models lead to a compressed sfermion spectrum with the sleptonsoften heavier than the squarks at least for the first two generations. Therelic density here is governed by gluino coannihilation which is responsiblefor a relatively small mass splitting between the gluino and the neutralinomasses. Thus the GNLSP class of models is very predictive first because theSUSY production cross sections at the LHC are dominated by gluino productionand second because the gluino production itself proceeds dominantly through asingle channel which allows for a direct determination of the gluino mass andan indirect determination of the neutralino mass due to a linear relationbetween these two masses which is highly constrained by coannihilation. Adetailed analysis of these models shows that the jet production and taggedb-jets from the gluino production can be discriminated from the standard modelbackground with appropriate cuts. It is found that the GNLSP models can betested with just 10 fb$^{-1}$ of integrated luminosity and may therefore bechecked with low luminosity runs in the first data at the LHC. Thus if a GNLSPmodel is realized, the LHC will turn into a gluino factory through a profuseproduction of gluinos with typically only a small fraction $\lesssim 5%$ oftotal SUSY events arising from other production modes over the allowed GNLSPmodel parameter space.

Gluino NLSP, Dark Matter via Gluino Coannihilation, and LHC Signatures