Lower Bound on the Neutralino Mass from New Data on CMB and Implications for Relic Neutralinos

Details Lower Bound on the Neutralino Mass from New Data on CMB and Implications for Relic Neutralinos Lower Bound on the Neutralino Mass from New Data on CMB and Implications for Relic Neutralinos

2003-04-08

arxiv.org/abs/hep-ph/0304080v2

Phys.Rev.D68:043506,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 4 figures, typeset with ReVTeX4. Minor misprint corrected. To appear in PRD

Scientific paper

10.1103/PhysRevD.68.043506

In the frame of an effective MSSM model without gaugino-mass unification at a grand unification (GUT) scale, we set a lower bound on the neutralino mass based on the new WMAP data on $\Omega_{CDM}$. Our lower bound, $m_{\chi} \gsim 6$ GeV, leaves much room for relic neutralinos significantly lighter than those commonly considered ($m_{\chi} \gsim 50$ GeV). We prove that these light neutralinos may produce measurable effects in WIMP direct detection experiments of low energy threshold and large exposure.

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