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arXiv · hep-ph/9607292

Supersymmetric Dark Matter in the Light of LEP 1.5

John Ellis·Toby Falk·Keith Olive·Michael Schmitt
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Abstract

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 Z peak and LEP 1.5, which appear when $μ<0$ for certain values of the sneutrino mass $m_{\tildeν}$ and the ratio $\tanβ$ of supersymmetric Higgs vacuum expectation values, may be largely or totally excluded by data from lower-energy $e^+e^-$ data, 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 $m_χ \ge 21.4~\gev$, if soft supersymmetry-breaking masses are assumed to be universal at the grand-unification scale.

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John Ellis, Toby Falk, Keith Olive, Michael Schmitt. 1996-07-11. Supersymmetric Dark Matter in the Light of LEP 1.5. https://doi.org/10.1016/0370-2693(96)01130-6

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