1998/06/30 by H. Baer, Howard Baer, K. Cheung +3 · 13 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.59.075002
published as Phys.Rev.D59:075002,1999 · 70 pages, latex, 43 figures, submitted to Phys. Rev. D. Revisions: a) event-by-event Monte Carlo employed for all gluino -> charged fragmentation probabilities; b) CDF limits corrected to conform to the exact algorithm employed in CDF analysis --- net result is that limits are improved at low mass -> no OPAL/CDF gap for any charged fragmentation probability; c) sensitivity to gluino path length and energy deposit explored; d) limits in case where gluino -> gluon + gravitino determined
arxiv created 1998/09/21 · openalex publication_date 1999/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 \else \~\fig\ensuremath-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 \else \~\fig\ensuremath-LSP. We next investigate limits on the \stackrel\ifmmode \else \~\fig\ensuremath-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 \else \~\fig that can be excluded depends upon the path length of the \stackrel\ifmmode \else \~\fig in the detector, the amount of energy it deposits in each hadronic collision, and the probability for the \stackrel\ifmmode \else \~\fig to fragment to a pseudo-stable charged hadron after a given hadronic collision. We explore how the range of excluded m_\stackrel\ifmmode \else \~\fig depends upon these ingredients, concluding that for non-extreme cases the range 3GeV\ensuremath\lesssimm_\stackrel\ifmmode \else \~\fig\ensuremath\lesssim130--150GeV 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 \else \~\fig) up to m_\stackrel\ifmmode \else \~\fig\ensuremath∼160--180GeV. For completeness, we also analyze the case where the \stackrel\ifmmode \else \~\fig is the NLSP (as possible in gauge-mediated supersymmetry breaking) decaying via \stackrel\ifmmode \else \~\fig\ensuremath→g+gravitino. We find that the Tevatron run I data exclude m_\stackrel\ifmmode \else \~\fig<~240GeV. Finally, we discuss application of the procedures developed for the heavy \stackrel\ifmmode \else \~\fig\ensuremath-LSP to searches for other stable strongly interacting particles, such as a stable heavy quark.