Dark Matter implications of DAMA/LIBRA-phase2 results
Sebastian Baum, Katherine Freese, and Chris Kelso
TL;DR
The updated DAMA/LIBRA-phase2 results challenge the canonical spin-independent dark matter interpretation, favoring isospin-violating or spin-dependent interactions with specific mass ranges, thus impacting dark matter detection models.
Contribution
This paper analyzes the latest DAMA/LIBRA-phase2 data, demonstrating that standard spin-independent dark matter models are disfavored and exploring alternative interaction scenarios.
Findings
Canonical spin-independent interactions are disfavored by the new data.
Good fits are found for isospin-violating and spin-dependent interactions at specific dark matter masses.
The data constrains dark matter interaction types and mass ranges, impacting future detection strategies.
Abstract
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…
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