Proton-philic spin-dependent inelastic Dark Matter (pSIDM) as a viable explanation of DAMA/LIBRA-phase2

Abstract

We show that the Weakly Interacting Massive Particle scenario of proton-philic spin-dependent inelastic Dark Matter (pSIDM) can still provide a viable explanation of the observed DAMA modulation amplitude in compliance with the constraints from other experiments after the release of the DAMA/LIBRA-phase2 data and including the recent bound from COSINE-100, that uses the same $NaI$ target of DAMA. The pSIDM scenario provided a viable explanation of DAMA/LIBRA--phase1 both for a Maxwellian WIMP velocity distribution and in a halo-independent approach. At variance with DAMA/LIBRA-phase1, for which the modulation amplitudes showed an isolated maximum at low energy, the DAMA/LIBRA-phase2 spectrum is compatible to a monotonically decreasing one. Moreover, due to its lower threshold, it is sensitive to WIMP-iodine interactions at low WIMP masses. Due to the combination of these two effects pSIDM can now explain the yearly modulation observed by DAMA/LIBRA only when the WIMP velocity distribution departs from a standard Maxwellian. In this case the WIMP mass $m_{\chi }$ and mass splitting $\delta$ fall in the approximate ranges 7 GeV $\lesssim m_{\chi }\lesssim$ 17 GeV and 18 keV$\lesssim \delta \lesssim$29 keV. The recent COSINE-100 bound is naturally evaded in the pSDIM scenario due to its large expected modulation fractions.

arXiv comment8 pages, 4 figures. COSINE-100 bound added. Discussion extended. Updated to published version

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• WimPyDD: an object-oriented Python code for the calculation of WIMP direct detection signals
• Inelastic Dark Matter and the SABRE Experiment
• Isospin-Violating Dark Matter in the $U(1{)}^{\prime }$ Model with $E_6$ Origin
• Is a WIMP explanation of the DAMA modulation effect still viable?