  Spin-independent cross-section for neutralino dark matter scattering off
nuclei is investigated in the NMSSM. Several classes of blind spots for direct
detection of singlino-Higgsino dark matter are analytically identified,
including such that have no analog in the MSSM. It is shown that mixing of the
Higgs doublets with the scalar singlet has a big impact on the position of
blind spots in the parameter space. In particular, this mixing allows for more
freedom in the sign assignment for the parameters entering the neutralino mass
matrix, required for a blind spot to occur, as compared to the MSSM or the
NMSSM with decoupled singlet. Moreover, blind spots may occur for any
composition of a singlino-Higgsino LSP. Particular attention is paid to cases
with the singlet-dominated scalar lighter than the 125 GeV Higgs for which a
vanishing tree-level spin-independent scattering cross-section may result from
destructive interference between the Higgs and the singlet-dominated scalar
exchange. Correlations of the spin-independent scattering cross-section with
the Higgs observables are also discussed.
