  The new observation of CDMS II favors low mass WIMPs. Taking the CDMS II new
results as inputs, we consider a SM singlet: the darkon as the dark matter
candidate, which can be either scalar, fermion or vector. It is found that the
simplest scenario of DM+SM conflicts with the stringent constraint set by the
LHC data. New physics beyond the SM is needed, and in this work, we discuss an
extended standard model $SU_L(2)\otimes U_Y(1)\otimes U(1)'$ where $U(1)'$ only
couples to the darkon. The new gauge symmetry is broken into $U_{em}(1)$ and
two neutral bosons $Z^0$ and $Z'$ which are mixtures of $W^3_{\mu},\; B_{\mu}\;
X_{\mu}$ are resulted in. Following the literature and based on the CDMS data,
we make a complete analysis to testify the validity of the model. The cross
section of the elastic scattering between darkon and nucleon is calculated, and
the DM relic density is evaluated in the extended scenario as well. It is found
that considering the constraints from both cosmology and collider experiments,
only if $Z'$ is lighter than $Z^0$, one can reconcile all the presently
available data.
