Supersymmetric dark matter in the light of LEP 1.5

John Ellis, Toby Falk, Keith A. Olive, Michael Schmitt

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120 Scopus citations


We discuss the lower limit on the mass of the neutralino χ that can be obtained by combining data from e+e- annihilation at LEP and elsewhere with astrophysical and theoretical considerations. Loopholes in the purely experimental analysis of ALEPH data from the Z0 peak and LEP 1.5, which appear when μ. < 0 for certain values of the sneutrino mass m and the ratio tan β of supersymmetric Higgs vacuum expectation values, may be largely or totally excluded by data from lower-energy e+e- experiments, the hypothesis that most of the cosmological dark matter consists of χ particles, and the assumption that electroweak symmetry breaking is triggered by radiative corrections due to a heavy top quark. The combination of these inputs imposes mχ ≥ 21.4 GeV, if soft supersymmetry-breaking masses are assumed to be universal at the grand-unification scale.

Original languageEnglish (US)
Pages (from-to)97-105
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1
StatePublished - Nov 7 1996


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