Dark Matter from Hidden Forces
  We examine the possibility that dark matter may be the manifestation of dark
forces of a hidden sector, i.e. "Dark Force = Dark Matter." As an illustrative
and minimal example we consider the hidden SU(2)_h x U(1)_h gauge group. The
hidden dynamics is indirectly coupled to the Standard Model (SM) through
kinetic mixing of U(1)_h with the U(1)_Y of hypercharge. We assume a hidden
symmetry breaking pattern analogous to that of the SM electroweak symmetry,
augmented with an extra scalar that allows both the "hidden Z boson" Z_h and
the "hidden photon" \gamma_h to be massive. The "hidden W" bosons W_h are dark
matter in this scenario. This setup can readily accommodate a potential direct
detection signal for dark matter at ~10 GeV from CDMSII-Si data. For some
choices of parameters, the model can lead to signals both in "dark matter beam"
experiments, from Z_h\to W_h W_h, as well as in experiments that look for
visible signals of dark photons, mediated by \gamma_h. Other possible
phenomenological consequences are also briefly discussed.
