Spin-dependent constraints on blind spots for thermal singlino-higgsino dark matter with(out) light singlets

Understand

The LUX experiment has recently set very strong constraints on spin-independent interactions of WIMP with nuclei.

• These null results can be accommodated in NMSSM provided that the effective spin-independent coupling of the LSP to nucleons is suppressed.
• We investigate thermal relic abundance of singlino-higgsino LSP in these so-called spin-independent blind spots and derive current constraints and prospects for direct detection of spin-dependent interactions of the LSP with nuclei providing strong constraints on parameter space.
• We show that if the Higgs boson is the only light scalar the new LUX constraints set a lower bound on the LSP mass of about 300 GeV except for a small range around the half of $Z^0$ boson masses where resonant annihilation via $Z^0$ exchange dominates.