Excluding Light Gluinos from Z decays

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dc.creatorde Gouvea, Andre
dc.creatorMurayama, Hitoshi
dc.date1996-06-27
dc.date1997-03-19
dc.date.accessioned2026-07-07T10:33:20Z
dc.date.available2026-07-07T10:33:20Z
dc.descriptionWe reanalyze the constraints on light gluinos (m_{\tilde{g}}\leq 5 GeV/c^2) 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 \lesssim 1.5 GeV/c^2 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.
dc.description12 pages, LaTeX, uses psfig, four EPS figures. Discussions on possible NLO corrections expanded. Version to appear in Phys. Lett. B
dc.identifierhttps://arxiv.org/abs/hep-ph/9606449
dc.identifierhttp://arxiv.org/abs/hep-ph/9606449
dc.identifierPhys.Lett.B400:117-123,1997
dc.identifierdoi:10.1016/S0370-2693(97)00312-2
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179071
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleExcluding Light Gluinos from Z decays
dc.typetext

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