Dark Matter implications of DAMA/LIBRA-phase2 results
  Recently, the DAMA/LIBRA collaboration released updated results from their
search for the annual modulation signal from Dark Matter (DM) scattering in the
detector. Besides approximately doubling the exposure of the DAMA/LIBRA data
set, the updated photomultiplier tubes of the experiment allow a lower recoil
energy threshold of 1\,keV electron equivalent compared to the previous
threshold of 2 keV electron equivalent. We study the compatibility of the
observed modulation signal with DM scattering. Due to a conspiracy of multiple
effects, the new data at low recoil energies is very powerful for testing the
DM hypothesis. We find that canonical (isospin conserving) spin-independent
DM-nucleon interactions are no longer a good fit to the observed modulation
signal in the standard halo model. The canonical spin-independent case is
disfavored by the new data, with best fit points of a DM mass of $\sim 8\,$GeV,
disfavored by $5.2\,\sigma$, or a mass of $\sim 54\,$GeV, disfavored by
$2.5\,\sigma$. Allowing for isospin violating spin independent interactions, we
find a region with a good fit to the data with suppressed effective couplings
to iodine for DM masses of $\sim 10\,$GeV. We also consider spin-dependent
DM-nucleon interactions, which yield good fits for similar DM masses of $\sim
10\,$GeV or $\sim 45\,$GeV
