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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
verification ladder T0 review T1 audit T2 compute T3 formal
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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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