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Adhikari, G.; Adhikari, P.; de Souza, E. Barbosa; Carlin, N.; Choi, S.; Djamal, M.; Ezeribe, A.C.; Ha, C.; Hahn, I.S.; Jeon, E.J.; Jo, J.H.; Joo, H. W.; Kang, W.G.; Kang, W.; 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.; Ko, Y.J.; Kudryavtsev, V.A.; Lee, H.S.; Lee, J.; Lee, J.Y.; Lee, M.H.; Leonard, D.S.; Lynch, W.A.; Maruyama, R.H.; Mouton, F.; 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.; Kang, Sunghyun; Scopel, Stefano; Tomar, Gaurav; Yoon, Jong-Hyun
Journal of cosmology and astroparticle physics, 06/2019, Volume: 2019, Issue: 6Journal Article
Assuming a standard Maxwellian for the WIMP velocity distribution, we obtain the bounds from null WIMP search results of 59.5 days of COSINE-100 data on the DAMA/LIBRA-phase2 modulation effect within the context of the non-relativistic effective theory of WIMP-nucleus scattering. Here, we systematically assume that one of the effective operators allowed by Galilean invariance dominates in the effective Hamiltonian of a spin-1/2 dark matter (DM) particle. We find that, although DAMA/LIBRA and COSINE-100 use the same sodium-iodide target, the comparison of the two results still depends on the particle-physics model. This is mainly due to two reasons: i) the WIMP signal spectral shape; ii) the expected modulation fractions, when the upper bound on the time-averaged rate in COSINE-100 is converted into a constraint on the annual modulation component in DAMA/LIBRA . We find that the latter effect is the dominant one. For several effective operators the expected modulation fractions are larger than in the standard spin-independent or spin-dependent interaction cases. As a consequence, compatibility between the modulation effect observed in DAMA/LIBRA and the null result from COSINE-100 is still possible for several non-relativistic operators. At low WIMP masses such relatively high values of the modulation fractions arise because COSINE-100 is mainly sensitive to WIMP-sodium scattering events, due to the higher threshold compared to DAMA/LIBRA . A next COSINE analysis is expected to have a full sensitivity for the 5 σ region of DAMA/LIBRA.
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