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arxiv: 2111.08863 · v2 · pith:W56S2QQ7new · submitted 2021-11-17 · ✦ hep-ex · astro-ph.IM· physics.ins-det

Three-year annual modulation search with COSINE-100

COSINE-100 Collaboration: G. Adhikari , E. Barbosa de Souza , N. Carlin , J. J. Choi , S. Choi , A. C. Ezeribe , L. E. Fran\c{c}a , C. Ha
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I. S. Hahn S. J. Hollick E. J. Jeon J. H. Jo H. W. Joo W. G. Kang M. Kauer H. Kim H. J. Kim J. Kim K. W. Kim S. H. Kim S. K. Kim W. K. Kim Y. D. Kim Y. H. Kim Y. J. Ko H. J. Kwon D. H. Lee E. K. Lee H. Lee H. S. Lee H. Y. Lee I. S. Lee J. Lee J. Y. Lee M. H. Lee S. H. Lee S. M. Lee D. S. Leonard B. B. Manzato R. H. Maruyama R. J. Neal S. L. Olsen B. J. Park H. K. Park H. S. Park K. S. Park S. D. 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
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classification ✦ hep-ex astro-ph.IMphysics.ins-det
keywords modulationannualcdotdarkcosine-100energymattersignal
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COSINE-100 is a direct detection dark matter experiment that aims to test DAMA/LIBRA's claim of dark matter discovery by searching for a dark matter-induced annual modulation signal with NaI(Tl) detectors. We present new constraints on the annual modulation signal from a dataset with a 2.82 yr livetime utilizing an active mass of 61.3 kg, for a total exposure of 173 kg$\cdot$yr. This new result features an improved event selection that allows for both lowering the energy threshold to 1 keV and a more precise time-dependent background model. In the 1-6 keV and 2-6 keV energy intervals, we observe best-fit values for the modulation amplitude of 0.0067$\pm$0.0042 and 0.0051$\pm$0.0047 counts/(day$\cdot$kg$\cdot$keV), respectively, with a phase fixed at 152.5 days.

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