Superlight neutralino as a dark matter particle candidate

V. A. Bednyakov, H. V. Klapdor-Kleingrothaus, and S. G. Kovalenko
Phys. Rev. D 55, 503 – Published 15 January 1997
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Abstract

We address the question of how light the lightest supersymmetric particle neutralino can be to be a reliable cold dark matter (CDM) particle candidate. To this end we perform 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→sγ decay. Appropriate grand unification (GUT) scenarios are considered. We find that the relaxation of gaugino mass unification is sufficient to obtain a phenomenologically and cosmologically viable solution of the MSSM with a neutralino as light as 3 GeV. We find good prospects for the 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.

  • Received 2 August 1996

DOI:https://doi.org/10.1103/PhysRevD.55.503

©1997 American Physical Society

Authors & Affiliations

V. A. Bednyakov

  • Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029, Heidelberg, Germany
  • Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, Moscow region, 141980 Dubna, Russia

H. V. Klapdor-Kleingrothaus

  • Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029, Heidelberg, Germany

S. G. Kovalenko

  • Max-Planck-Institut für Kernphysik, Postfach 103980, D-69029, Heidelberg, Germany
  • Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, Moscow region, 141980 Dubna, Russia

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Vol. 55, Iss. 2 — 15 January 1997

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