Lower bound on the neutralino mass from new data on CMB and implications for relic neutralinos

A. Bottino, F. Donato, N. Fornengo, S. Scopel
2003 Physical Review D, Particles and fields  
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 Ω_CDM. Our lower bound, m_χ 6 GeV, leaves much room for relic neutralinos significantly lighter than those commonly considered (m_χ 50 GeV). We prove that these light neutralinos may produce measurable effects in WIMP direct detection experiments of low energy threshold and large exposure.
doi:10.1103/physrevd.68.043506 fatcat:agqbmmaozralpderlui7ov6i6e