Supersymmetric dark matter in the light of CERN LEP and the Fermilab Tevatron collider

Journal Article · Sun Oct 01 04:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.075010· OSTI ID:20217744

Ellis, John ^[1]; Falk, Toby ^[2]; Ganis, Gerardo ^[3]; Olive, Keith A ^[4]

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1. TH Division, CERN, Geneva, (Switzerland)
2. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
3. Max-Planck-Institut fuer Physik, Munich, (Germany)
4. Theoretical Physics Institute, School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455 (United States)

We analyze the accelerator constraints on the parameter space of the minimal supersymmetric extension of the standard model, comparing those now available from CERN LEP II and anticipating the likely sensitivity of Fermilab Tevatron run II. The most important limits are those from searches for charginos {chi}{sup {+-}}, neutralinos {chi}{sub i} and Higgs bosons at LEP, and searches for top squarks, charginos and neutralinos at the Tevatron collider. We also incorporate the constraints derived from b{yields}s{gamma} decay, and discuss the relevance of charge- and color-breaking minima in the effective potential. We combine and compare the different constraints on the Higgs-mixing parameter {mu}, the gaugino-mass parameter m{sub 1/2} and the scalar-mass parameter m{sub 0}, incorporating radiative corrections to the physical particle masses. We focus on the resulting limitations on supersymmetric dark matter, assumed to be the lightest neutralino {chi}, incorporating coannihilation effects in the calculation of the relic abundance. We find that m{sub {chi}}>51 GeV and tan{beta}>2.2 if all soft supersymmetry-breaking scalar masses are universal, including those of the Higgs bosons, and that these limits weaken to m{sub {chi}}>46 GeV and tan{beta}>1.9 if nonuniversal scalar masses are allowed. Light neutralino dark matter cannot be primarily Higgsino in composition. (c) 2000 The American Physical Society.

• OSTI ID: 20217744
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 62; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
FERMILAB TEVATRON
HIGGS BOSONS
NONLUMINOUS MATTER
RADIATIVE CORRECTIONS
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
THEORETICAL DATA