Limit on the mass of a long-lived or stable gluino

• Published in: The journal of high energy physics 2011-02, Vol.2011 (2), p.018, Article 18
• Main Authors: Farrar, G. R., Mackeprang, R., Milstead, D., Roberts, J. P.
• Format: Article
• Language: English
• Subjects: Charged particles; Classical and Quantum Gravitation; Elementarpartikelfysik; Elementary particle physics; Elementary Particles; Fysik; High energy physics; NATURAL SCIENCES; NATURVETENSKAP; Physics; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Relativity Theory; Scattering cross sections; String Theory; Supersymmetry Phenomenology; Uncertainty
• ISSN: 1029-8479; 1126-6708; 1029-8479
• DOI: 10.1007/JHEP02(2011)018

We reinterpret the generic CDF charged massive particle limit to obtain a limit on the mass of a stable or long-lived gluino. Various sources of uncertainty are examined. The R -hadron spectrum and scattering cross sections are modeled based on known low-energy hadron physics and the resultant uncertainties are quantified and found to be small compared to uncertainties from the scale dependence of the NLO pQCD production cross sections. The largest uncertainty in the limit comes from the unknown squark mass: when the squark — gluino mass splitting is small, we obtain a gluino mass limit of 407 GeV,while in the limit of heavy squarks the gluino mass limit is 397 GeV. For arbitrary (degenerate) squark masses, we obtain a lower limit of 322 GeV on the gluino mass. These limits apply for any gluino lifetime longer than ∼30 ns, and are the most stringent limits for such a long-lived or stable gluino.