Excluding light gluinos from Z decays

André De Gouvêa, Hitoshi Murayama

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We reanalyze the constraints on light gluinos (m ≤ 5 GeV/c2) from the hadronic Z decays into four jets. We find that the published OPAL data from the 1991 and 1992 runs exclude a light quasi-stable gluino with mass ≲ 1.5 GeV/c2 at more than 90% confidence level. This limit depends little on assumptions about the gluino fragmentation and the definition of the gluino mass. The exclusion confidence level is shown as a function of the mass. A future projection is briefly discussed. We also discuss quantitatively how the distributions in the Bengtsson-Zerwas and the modified Nachtmann-Reiter angles change due to the finite bottom quark or gluino mass. The analysis is limited to the leading-order calculations. We, however, give an empirical reason to why the next-to-leading-order corrections are unlikely to change our conclusions.

Original languageEnglish (US)
Pages (from-to)117-123
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - May 8 1997

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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