Gluino Coannihilations and Heavy Bino Dark Matter

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  • 23 February 2004
Abstract
We outline a new low-energy supersymmetry scenario, compatible with all cosmological and phenomenological requirements, where the lightest SUSY particles (LSPs) are a bino-like neutralino and a quasi degenerate gluino. The interplay of the bino nature of the lightest neutralino and of gluino coannihilations yields a relic abundance in the correct range for the LSP to be the main cold dark matter constituent. We show that the gluino is the strongest possible coannihilating partner of a bino-like LSP in the general MSSM, allowing the determination of an absolute upper bound on the mass of a stable, bino-like lightest neutralino. We point out that this scenario may arise in supergravity inspired frameworks with non-universalities both in the gaugino and in the Higgs sector.

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