Superlight neutralino as a dark matter particle candidate

Details Superlight neutralino as a dark matter particle candidate Superlight neutralino as a dark matter particle candidate

1996-08-06

arxiv.org/abs/hep-ph/9608241v1

Phys.Rev. D55 (1997) 503-514

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 5 Postscript figures

Scientific paper

10.1103/PhysRevD.55.503

We address the question of how light can be the lightest supersymmetric particle neutralino to be a reliable cold dark matter (CDM) particle candidate. To this end we have performed a combined analysis of the parameter space of the Minimal Supersymmetric Standard Model (MSSM) taking into account cosmological and accelerator constraints including those from the radiative $b\rightarrow s\gamma$ decay. Appropriate grand unification (GUT) scenarios were considered. We have found that the relaxation of gaugino mass unification is sufficient to obtain a phenomenologically and cosmologically viable solution of the MSSM with the neutralino as light as 3~GeV. We have found good prospects for direct detection of these superlight CDM neutralinos via elastic scattering off various nuclei in the forthcoming experiments with low-threshold DM detectors. In a certain sense, these experiments can probe the gaugino mass unification giving constraints on the possible GUT scenarios within the MSSM.

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