  Dark matter particles with masses in the sub-GeV range have escaped severe
constraints from direct detection experiments such as LUX, PANDAX-II and
XENON100 as the corresponding recoil energies are, largely, lower than the
detector thresholds. In a companion paper, we demonstrated, in a model
independent approach, that a significantly large fraction of the parameter
space escapes the cosmological and astrophysical constraints. We show here,
though, that the remaining parameter space lends itself to the possibility of
discovery at both direct detection experiments (such as CRESST-II) as well as
in a low-energy collider such as Belle-II.
