Higgsino-like Dark Matter From Sneutrino Late Decays
Résumé
We consider Higgsino-like dark matter (DM) in the Minimal Supersymmetric Standard Model (MSSM) with additional right-handed neutrino chiral superfields, and propose a new non-thermal way of generating the right amount of relic DM via sneutrino late decays. Due to the large DM annihilation cross-section, decays must occur at lower temperatures than the freeze-out temperature Td≪TF,χ˜10∼μ/25 , implying a mostly right-handed lightest sneutrino with very small Yukawa interactions. In that context, the right amount of Higgsino-like DM relic density can be accounted for if sneutrinos are produced via thermal freeze-in in the early Universe.
Mots clés
new physics
supersymmetry: dark matter
minimal supersymmetric standard model
Higgsino: LSP
Higgsino: dark matter
dark matter: relic density
dark matter: annihilation
dark matter: freeze-out
freeze-out: temperature
sneutrino: decay
neutrino: final state
neutrino: right-handed
sneutrino --> neutrino Higgsino