Hunting the lightest lightest neutralinos

Details Hunting the lightest lightest neutralinos Hunting the lightest lightest neutralinos

2008-06-12

arxiv.org/abs/0806.2150v1

Phys.Rev.D78:023507,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 5 figures, accepted for publication in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.78.023507

The lightest neutralino in the minimal supersymmetric extension of the Standard Model can be, in principle, massless. If super-light neutralinos are the dark matter, structure formation constrains their mass to be above a few keV. We show that relaxing the assumption of radiation domination and entropy conservation prior to Big Bang Nucleosynthesis, the relic abundance of very light neutralinos can be consistent with the inferred cold dark matter density. We study how we can hunt for light neutralino dark matter, with a mass at or below a GeV, focusing on both direct and indirect searches. We argue that the two most promising channels are spin-dependent direct detection and the search for monochromatic gamma rays from the prompt pair-annihilation of neutralinos into photons with GLAST. Our study indicates that the lightest lightest neutralinos can be detected as long as their mass is above a few tenth of a GeV, a mass range where a future linear collider could provide important information on the details of the particle dark matter model.

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