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Lowering the energy threshold in COSINE-100 dark matter searches

Authors
Adhikari, G.de Souza, E. BarbosaCarlin, N.Choi, J. J.Choi, S.Djamal, M.Ezeribe, A. C.Franca, L. E.Ha, C.Hahn, I. S.Jeon, E. J.Jo, J. H.Kang, W. G.Kauer, M.Kim, H.Kim, H. J.Kim, K. W.Kim, S. K.Kim, Y. D.Kim, Y. H.Ko, Y. J.Lee, E. K.Lee, H. S.Lee, J.Lee, J. Y.Lee, M. H.Lee, S. H.Leonard, D. S.Manzato, B. B.Maruyama, R. H.Neal, R. J.Olsen, S. L.Park, B. J.Park, H. K.Park, H. S.Park, K. S.Pitta, R. L. C.Prihtiadi, H.Ra, S. J.Rott, C.Shin, K. A.Scarff, A.Spooner, N. J. C.Thompson, W. G.Yang, L.Yu, G. H.
Issue Date
7월-2021
Publisher
ELSEVIER
Keywords
COSINE-100; Dark matter; Low threshold; NaI(Tl)
Citation
ASTROPARTICLE PHYSICS, v.130
Indexed
SCIE
SCOPUS
Journal Title
ASTROPARTICLE PHYSICS
Volume
130
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137235
DOI
10.1016/j.astropartphys.2021.102581
ISSN
0927-6505
Abstract
COSINE-100 is a dark matter detection experiment that uses NaI(Tl) crystal detectors operating at the Yangyang underground laboratory in Korea since September 2016. Its main goal is to test the annual modulation observed by the DAMA/LIBRA experiment with the same target medium. Recently DAMA/LIBRA has released data with an energy threshold lowered to 1 keV, and the persistent annual modulation behavior is still observed at 9.5 sigma. By lowering the energy threshold for electron recoils to 1 keV, COSINE-100 annual modulation results can be compared to those of DAMA/LIBRA in a model-independent way. Additionally, the event selection methods provide an access to a few to sub-GeV dark matter particles using constant rate studies. In this article, we discuss the COSINE-100 event selection algorithm, its validation, and efficiencies near the threshold. (C) 2021 Elsevier B.V. All rights reserved.
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