Light neutralino dark matter with a very light Higgs for CoGeNT and DAMA/LIBRA data

TL;DR

This paper proposes a light neutralino dark matter model with a very light Higgs boson to explain CoGeNT and DAMA/LIBRA signals, consistent with LEP and WMAP data, predicting a neutralino mass around 5-6 GeV.

Contribution

It introduces a novel light neutralino dark matter scenario mediated by a very light Higgs, compatible with experimental constraints and relic abundance.

Findings

Neutralino mass predicted around 5-6 GeV.

Light Higgs mass in 9-10 GeV range.

Consistent with CoGeNT, DAMA/LIBRA, LEP, and WMAP data.

Abstract

Recently, the CoGeNT collaboration reported the WIMP candidate signal events exceeding the known backgrounds where the light WIMP with large cross section is supported. Motivated by this issue, we analyze a light neutralino dark matter scenario with a very light CP-even Higgs mediation in the elastic scattering process, which provides the mass and direct detection cross section to explain the CoGeNT result. To be compatible with the result of LEP experiments, the light CP-even Higgs is favored to be in 9 to 10 GeV. Such a scenario can be realized in the "Beyond the MSSM" context. The relic abundance consistent with the WMAP result can be obtained when twice of neutralino mass is close to the light Higgs mass via the resonance enhancement of the annihilation cross section. As a result, the neutralino mass is predicted to be at around 5 to 6 GeV.