An optimistic CoGeNT analysis
  Inspired by a recently proposed model of millicharged atomic dark matter
(MADM), we analyze several classes of light dark matter models with respect to
CoGeNT modulated and unmodulated data, and constraints from CDMS, XENON10 and
XENON100. After removing the surface contaminated events from the original
CoGeNT data set, we find an acceptable fit to all these data (but with the
modulating part of the signal making a statistically small contribution), using
somewhat relaxed assumptions about the response of the null experiments at low
recoil energies, and postulating an unknown modulating background in the CoGeNT
data at recoil energies above 1.5 keVee. We compare the fits of MADM---an
example of inelastic magnetic dark matter---to those of standard elastically
and inelastically scattering light WIMPs (eDM and iDM). The iDM model gives the
best fit, with MADM close behind. The dark matter interpretation of the DAMA
annual modulation cannot be made compatible with these results however. We find
that the inclusion of a tidal debris component in the dark matter phase space
distribution improves the fits or helps to relieve tension with XENON
constraints.
