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Lowering threshold of NaI(Tl) scintillator to 0.7 keV in the COSINE-100 experiment

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arxiv 2408.14688 v2 pith:4JZ2Z4IE submitted 2024-08-26 hep-ex physics.ins-det

G. H. Yu , N. Carlin , J. Y. Cho , J. J. Choi , S. Choi , A. C. Ezeribe , L. E. França , C. Ha
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I. S. Hahn S. J. Hollick E. J. Jeon H. W. Joo W. G. Kang M. Kauer B. 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 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 Y. J. Lee D. S. Leonard N. T. Luan V. H. A. Machado B. B. Manzato R. H. Maruyama R. J. Neal S. L. Olsen B. J. Park H. K. Park H. S. Park J. C. Park K. S. Park S. D. Park R. L. C. Pitta H. Prihtiadi S. J. Ra C. Rott K. A. Shin D. F. F. S. Cavalcante M. K. Son N. J. C. Spooner L. T. Truc L. Yang
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classification hep-exphysics.ins-det
keywords thresholdcosine-100damaanalysisannualdarkexperimentlibra
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abstract

COSINE-100 is a direct dark matter search experiment, with the primary goal of testing the annual modulation signal observed by DAMA/LIBRA, using the same target material, NaI(Tl). In previous analyses, we achieved the same 1 keV energy threshold used in the DAMA/LIBRA's analysis that reported an annual modulation signal with 11.6$\sigma$ significance. In this article, we report an improved analysis that lowered the threshold to 0.7 keV, thanks to the application of Multi-Layer Perception network and a new likelihood parameter with waveforms in the frequency domain. The lower threshold would enable a better comparison of COSINE-100 with new DAMA results with a 0.75 keV threshold and account for differences in quenching factors. Furthermore the lower threshold can enhance COSINE-100's sensitivity to sub-GeV dark matter searches.

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  1. The SABRE South Technical Design Report Executive Summary

    physics.ins-det 2024-11 conditional novelty 5.0 of 10

    SABRE South, a 35-50 kg NaI(Tl) detector with a liquid scintillator veto at the Stawell Underground Physics Laboratory, is projected to reach 5 sigma discovery or 3 sigma exclusion of the DAMA/LIBRA annual modulation ...

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