Motivated by recent data from CoGeNT and the DAMA annual modulation signal, we discuss collider constraints on the minimal supersymmetric standard model neutralino dark matter with mass in the 5-15 GeV range. The lightest superpartner (LSP) would be a bino with a small Higgsino admixture. Maximization of the dark matter nucleon scattering cross section for such a weakly interacting massive particle requires a light Higgs boson with tanβ enhanced couplings. Limits on the invisible width of the Z boson, combined with the rare decays B±→τν, and the ratio B→Dτν/B→D ν, constrain cross sections to be below σn 5×10-42cm2. This indicates a higher local dark matter density than is usually assumed by a factor of roughly 6 necessary to explain the CoGeNT excess. This scenario also requires a light charged Higgs boson, which can give substantial contributions to rare decays such as b→sγ and t→bH+. We also discuss the impact of Tevatron searches for Higgs bosons at large tan β.
|Physical Review D - Particles, Fields, Gravitation and Cosmology
|Published - 28 Jun 2010