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• W2007656272 abstract "We consider the possibility that the lightest supersymmetric particle is a heavy gluino. After discussing models in which this is the case, we demonstrate that the $stackrel{ifmmode tilde{}else ~{}fi{}}{g}ensuremath{-}mathrm{LSP}$ could evade cosmological and other constraints by virtue of having a very small relic density. We then consider how neutral and charged hadrons containing a gluino will behave in a detector, demonstrating that there is generally substantial apparent missing momentum associated with a produced $stackrel{ifmmode tilde{}else ~{}fi{}}{g}ensuremath{-}mathrm{LSP}.$ We next investigate limits on the $stackrel{ifmmode tilde{}else ~{}fi{}}{g}ensuremath{-}mathrm{LSP}$ deriving from CERN, LEP, LEP2 and run I Fermilab Tevatron experimental searches for excess events in the jets plus missing momentum channel and for stable heavily ionizing charged particles. The range of ${m}_{stackrel{ifmmode tilde{}else ~{}fi{}}{g}}$ that can be excluded depends upon the path length of the $stackrel{ifmmode tilde{}else ~{}fi{}}{g}$ in the detector, the amount of energy it deposits in each hadronic collision, and the probability for the $stackrel{ifmmode tilde{}else ~{}fi{}}{g}$ to fragment to a pseudo-stable charged hadron after a given hadronic collision. We explore how the range of excluded ${m}_{stackrel{ifmmode tilde{}else ~{}fi{}}{g}}$ depends upon these ingredients, concluding that for non-extreme cases the range $3mathrm{GeV}ensuremath{lesssim}{m}_{stackrel{ifmmode tilde{}else ~{}fi{}}{g}}ensuremath{lesssim}130--150mathrm{GeV}$ can be excluded at 95% C.L. based on currently available OPAL and CDF analyses. We find that run II at the Tevatron can extend the excluded region (or discover the $stackrel{ifmmode tilde{}else ~{}fi{}}{g})$ up to ${m}_{stackrel{ifmmode tilde{}else ~{}fi{}}{g}}ensuremath{sim}160--180mathrm{GeV}.$ For completeness, we also analyze the case where the $stackrel{ifmmode tilde{}else ~{}fi{}}{g}$ is the NLSP (as possible in gauge-mediated supersymmetry breaking) decaying via $stackrel{ifmmode tilde{}else ~{}fi{}}{g}ensuremath{rightarrow}g+mathrm{gravitino}.$ We find that the Tevatron run I data exclude ${m}_{stackrel{ifmmode tilde{}else ~{}fi{}}{g}}<~240mathrm{GeV}.$ Finally, we discuss application of the procedures developed for the heavy $stackrel{ifmmode tilde{}else ~{}fi{}}{g}ensuremath{-}mathrm{LSP}$ to searches for other stable strongly interacting particles, such as a stable heavy quark." @default.
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• W2007656272 date "1999-02-17" @default.
• W2007656272 modified "2023-09-23" @default.
• W2007656272 title "Heavy gluino as the lightest supersymmetric particle" @default.
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• W2007656272 doi "https://doi.org/10.1103/physrevd.59.075002" @default.
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