LEP and radiative electroweak breaking close to the light gluino window

1993/05/12 by J. Lopez, Jorge L. Lopez, D.V. Nanopoulos +3 · 6 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1016/0370-2693(93)91219-d

published as Phys.Lett.B313:241-244,1993 · 6 pages, no figures, tex (harvmac), CERN-TH.6890, CTP-TAMU-25/93

arxiv created 1993/05/12 · openalex publication_date 1993/08/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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 tanβ=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.

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