LEP and radiative electroweak breaking close the light gluino window

Abstract

We show that the LEP lower bound on the chargino mass, in conjunction with the well motivated theoretical requirement of radiative electroweak symmetry breaking, imply an upper bound on the lightest Higgs boson mass ($m_h\lsim62\GeV$) in a supersymmetry breaking scenario where the gluino mass is a few GeV. Moreover, Higgs searches at LEP in the context of this model require $m_h\gsim61\GeV$. The remaining experimentally allowed region in the five-dimensional parameter space of this light gluino model is severely fine-tuned (with $\tan \beta =1.88-1.89$ and $m_t=114.0-114.3\GeV$) and cosmologically troublesome (with a neutralino relic abundance over {\it five-hundred times larger than allowed}). Modest improvements in sensitivity in LEP Higgs searches and Tevatron top-quark searches should soon exclude this theoretically disfavored model completely.

6 pages, no figures, tex (harvmac), CERN-TH.6890, CTP-TAMU-25/93

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• Experimental aspects of SU(5)xU(1) supergravity
• Supersymmetry: From the Fermi Scale to the Planck Scale
• Status of the superworld: from theory to experiment
• Radiative Symmetry Breaking and the Top Quark Mass in Local Supersymmetry
• Charginos and Neutralinos at LEPII
• Higgs and Z boson decays into light gluinos
• Closing the Light Gluino Window in Supersymmetric Grand Unified Models
• Light Neutralinos in B-Decays
• Low Energy Thresholds and the Scalar Mass Spectrum in Minimal Supersymmetry
• Can We Identify a Light Neutralino in B-Factories
• Angular Correlations and Light Gluinos in Multi-jet Photoproduction at HERA
• Chasing the light-gluino scenario through $b\to s\gamma$
• Using Gauge Coupling Unification and Proton Decay to Test Minimal Supersymmetric SU(5)
• Top Quark Analysis in the Light Gluino Scenario
• Light Gluinos and the Longitudinal Structure Function
• Tau-Universality Violation with Light Neutralinos