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dc.description.abstractAssuming 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. © 2019 IOP Publishing Ltd and Sissa Medialab.-
dc.publisherInstitute of Physics Publishing-
dc.subjectDark matter experiments-
dc.subjectDark matter theory-
dc.titleCOSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models-
dc.relation.journaltitleJournal of Cosmology and Astroparticle Physics-
dc.identifier.scopusid2-s2.0-85069476681- G.- P.- Souza E.B.- N.- S.- M.- A.C.- C.- I.S.- E.J.- J.H.- H.W.- W.G.- W.- M.- G.S.- H.- H.J.- K.W.- N.Y.- S.K.- Y.D.- Y.H.- Y.J.- V.A.- H.S.- J.- J.Y.- M.H.- D.S.- W.A.- R.H.- F.- S.L.- B.J.- H.K.- H.S.- K.S.- R.L.C.- H.- S.J.- C.- K.A.- A.- N.J.C.- W.G.- L.- G.H.- S.- S.- G.- J.-H.- COSINE-100 collaboration- Sogang Phenomenology Group-
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