Heavy gluino as the lightest supersymmetric particle
- Davis Institute for High Energy Physics, University of California, Davis, California 95616 (United States)
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 {tilde g}-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 {tilde g}-LSP. We next investigate limits on the {tilde g}-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{sub {tilde g}} that can be excluded depends upon the path length of the {tilde g} in the detector, the amount of energy it deposits in each hadronic collision, and the probability for the {tilde g} to fragment to a pseudo-stable charged hadron after a given hadronic collision. We explore how the range of excluded m{sub {tilde g}} depends upon these ingredients, concluding that for non-extreme cases the range 3;GeV{approx_lt} m{sub {tilde g}} {approx_lt} 130{endash} 150; GeV can be excluded at 95{percent} 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 {tilde g}) up to m{sub {tilde g}} {approximately} 160{endash} 180; GeV. For completeness, we also analyze the case where the {tilde g} is the NLSP (as possible in gauge-mediated supersymmetry breaking) decaying via {tilde g} {r_arrow} g+gravitino. We find that the Tevatron run I data exclude m{sub {tilde g}} {le}240; GeV. Finally, we discuss application of the procedures developed for the heavy {tilde g}-LSP to searches for other stable strongly interacting particles, such as a stable heavy quark. {copyright} {ital 1999} {ital The American Physical Society}
- OSTI ID:
- 328596
- Journal Information:
- Physical Review, D, Vol. 59, Issue 7; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
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