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⋅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±0.0042 and 0.0051±0.0047 counts/(day⋅kg⋅keV), respectively, with a phase fixed at 152.5 days.
@article{arxiv.2111.08863,
title = {Three-year annual modulation search with COSINE-100},
author = {100 Collaboration and G. Adhikari and E. Barbosa de Souza and N. Carlin and J. J. Choi and S. Choi and A. C. Ezeribe and L. E. França and C. Ha and I. S. Hahn and S. J. Hollick and E. J. Jeon and J. H. Jo and H. W. Joo and W. G. Kang and M. Kauer and H. Kim and H. J. Kim and J. Kim and K. W. Kim and S. H. Kim and S. K. Kim and W. K. Kim and Y. D. Kim and Y. H. Kim and Y. J. Ko and H. J. Kwon and D. H. Lee and E. K. Lee and H. Lee and H. S. Lee and H. Y. Lee and I. S. Lee and J. Lee and J. Y. Lee and M. H. Lee and S. H. Lee and S. M. Lee and D. S. Leonard and B. B. Manzato and R. H. Maruyama and R. J. Neal and S. L. Olsen and B. J. Park and H. K. Park and H. S. Park and K. S. Park and S. D. Park and R. L. C. Pitta and H. Prihtiadi and S. J. Ra and C. Rott and K. A. Shin and A. Scarff and N. J. C. Spooner and W. G. Thompson and L. Yang and G. H. Yu},
journal= {arXiv preprint arXiv:2111.08863},
year = {2022}
}