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COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models

G. Adhikari, P. Adhikari, E. Barbosa de Souza, N. Carlin, S. Choi, M. Djamal, A.C. Ezeribe, C. Ha, I.S. Hahn, E.J. Jeon, J.H. Jo, H. W. Joo (+40 others)
2019 Journal of Cosmology and Astroparticle Physics  

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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
more » ... INE-100 use the same sodium-iodide target, the comparison of the two results still depends on the particlephysics model. This is mainly due to two reasons: i) the WIMP signal spectral shape used for background subtraction in COSINE-100; 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.
doi:10.1088/1475-7516/2019/06/048 fatcat:rwbgawmg2vffxpuelqrafkb6uq
Citation

G. Adhikari, P. Adhikari, E. Barbosa de Souza, N. Carlin, S. Choi, M. Djamal, A.C. Ezeribe, C. Ha, I.S. Hahn, E.J. Jeon, J.H. Jo, H. W. Joo, W.G. Kang, W. Kang, M. Kauer, G.S. Kim, H. Kim, H.J. Kim, K.W. Kim, N.Y. Kim, S.K. Kim, Y.D. Kim, Y.H. Kim, Y.J. Ko, V.A. Kudryavtsev, H.S. Lee, J. Lee, J.Y. Lee, M.H. Lee, D.S. Leonard, W.A. Lynch, R.H. Maruyama, F. Mouton, S.L. Olsen, B.J. Park, H.K. Park, H.S. Park, K.S. Park, R.L.C. Pitta, H. Prihtiadi, S.J. Ra, C. Rott, K.A. Shin, A. Scarff, N.J.C. Spooner, W.G. Thompson, L. Yang, G.H. Yu, Sunghyun Kang, Stefano Scopel, Gaurav Tomar, Jong-Hyun Yoon. "COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models." Journal of Cosmology and Astroparticle Physics 2019.06 (2019) 048-048