Light Relic Neutralinos
classification
✦ hep-ph
astro-phhep-ex
keywords
neutralinoslightrelicabundanceanalyticalargumentsbelowcontribution
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The relic abundance and the scalar cross-section off nucleon for light neutralinos (of mass below about 45 GeV) are evaluated in an effective MSSM model without GUT-inspired relations among gaugino masses. It is shown that these neutralinos may provide a sizeable contribution to the matter density in the Universe and produce measurable effects in WIMP direct detection experiments. These properties are elucidated in terms of simple analytical arguments.
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