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  • Comparison between DAMA/LIB...
    Ko, Y.J.; Adhikari, G.; Adhikari, P.; de Souza, E. Barbosa; Carlin, N.; Choi, J.J.; Choi, S.; Djamal, M.; Ezeribe, A.C.; Ha, C.; Hahn, I.S.; Jeon, E.J.; Jo, J.H.; Kang, W.G.; Kauer, M.; Kim, G.S.; Kim, H.; Kim, H.J.; Kim, K.W.; Kim, N.Y.; Kim, S.K.; Kim, Y.D.; Kim, Y.H.; Lee, E.K.; Lee, H.S.; Lee, J.; Lee, J.Y.; Lee, M.H.; Lee, S.H.; Leonard, D.S.; Lynch, W.A.; Manzato, B.B.; Maruyama, R.H.; Neal, R.J.; Olsen, S.L.; Park, B.J.; Park, H.K.; Park, H.S.; Park, K.S.; Pitta, R.L.C.; Prihtiadi, H.; Ra, S.J.; Rott, C.; Shin, K.A.; Scarff, A.; Spooner, N.J.C.; Thompson, W.G.; Yang, L.; Yu, G.H.

    Journal of cosmology and astroparticle physics, 11/2019, Volume: 2019, Issue: 11
    Journal Article

    There is a long standing debate about whether or not the annual modulation signal reported by the DAMA/LIBRA collaboration is induced by Weakly Interacting Massive Particles (WIMP) in the galaxy's dark matter halo scattering from nuclides in their NaI(Tl) crystal target/detector. This is because regions of WIMP-mass vs. WIMP-nucleon cross-section parameter space that can accommodate the DAMA/LIBRA-phase1 modulation signal in the context of the standard WIMP dark matter galactic halo and isospin-conserving (canonical), spin-independent (SI) WIMP-nucleon interactions have been excluded by many of other dark matter search experiments including COSINE-100, which uses the same NaI(Tl) target/detector material. Moreover, the recently released DAMA/LIBRA-phase2 results are inconsistent with an interpretation as WIMP-nuclide scattering via the canonical SI interaction and prefer, instead, isospin-violating or spin-dependent interactions. Dark matter interpretations of the DAMA/LIBRA signal are sensitive to the NaI(Tl) scintillation efficiency for nuclear recoils, which is characterized by so-called quenching factors (QF), and the QF values used in previous studies differ significantly from recently reported measurements, which may have led to incorrect interpretations of the DAMA/LIBRA signal. In this article, the compatibility of the DAMA/LIBRA and COSINE-100 results, in light of the new QF measurements is examined for different possible types of WIMP-nucleon interactions. The resulting allowed parameter space regions associated with the DAMA/LIBRA signal are explicitly compared with 90% confidence level upper limits from the initial 59.5 day COSINE-100 exposure. With the newly measured QF values, the allowed 3σ regions from the DAMA/LIBRA data are still generally excluded by the COSINE-100 data.