Reassessing the Possibility of Dark Matter Discovery in the DAMA Signal

The DAMA/LIBRA Collaboration has, for the last 20 years, reported an annual modulation in possible dark matter interactions with ordinary matter that is consistent with the predicted existence of a dark matter halo surrounding the Milky Way Galaxy. However, despite these exciting results several similar detection experiments have been performed since DAMA/LIBRA first reported their results, with none of them upholding the claim of discovery. The goal of our research is to use numerical tools to provide more insight into the results of these experiments and narrow the list of possible explanations for the supposed discovery. We have used The Global And Modular BSM Inference Tool (GAMBIT) to more carefully describe the allowed properties of dark matter interactions that fit the data in these experiments and have created additional tools to help visualize these results. We have also implemented more recent data published on the quenching factors of sodium and iodine into our analyses and have re-affirmed the incompatibility of the results of the ANAIS-112 and COSINE-100 experiments with DAMA/LIBRA. We have further shown that a spin-independent interaction model for dark matter no longer fits the DAMA/LIBRA data, and that spin-dependent models alone provide acceptable fits.