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

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http://hdl.handle.net/10138/305156

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COSINE-100 Collaboration , Sogang Phenomenology Grp , Adhikari , G & Yoon , J-H 2019 , ' COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models ' , Journal of Cosmology and Astroparticle Physics , no. 6 , 048 . https://doi.org/10.1088/1475-7516/2019/06/048

Title: COSINE-100 and DAMA/LIBRA-phase2 in WIMP effective models
Author: COSINE-100 Collaboration; Sogang Phenomenology Grp; Adhikari, G.; Yoon, Jong-Hyun
Contributor: University of Helsinki, Department of Physics
Date: 2019-06
Language: eng
Number of pages: 22
Belongs to series: Journal of Cosmology and Astroparticle Physics
ISSN: 1475-7516
URI: http://hdl.handle.net/10138/305156
Abstract: 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 a region of DAMA/LIBRA.
Subject: dark matter experiments
dark matter theory
MODULATION
115 Astronomy, Space science
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