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arXiv · 2510.01927

Constraints on sub-GeV dark matter scattering on electrons with COSINE-100

N. Carlin·J. Y. Cho·S. J. Cho·S. Choi·A. C. Ezeribe·L. E. Franca·O. Gileva·C. Ha·I. S. Hahn·S. J. Hollick·E. J. Jeon·H. W. Joo·W. G. Kang·M. Kauer·B. H. Kim·D. Y. Kim·H. J. Kim·J. Kim·K. W. Kim·S. H. Kim·S. K. Kim·W. K. Kim·Y. D. Kim·Y. H. Kim·B. R. Ko·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·S. L. Olsen·H. K. Park·H. S. Park·J. C. Park·J. S. Park·K. S. Park·K. 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·G. H. Yu
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Abstract

We present results of the search for sub-GeV dark matter interaction with electrons in the NaI(Tl) crystals of the COSINE-100 experiment. The two benchmark scenarios of a heavy and a light vector boson as mediator of the interaction were studied. We found no excess events over the expected background in a data-set of 2.82 years, with a total exposure of 172.9 kg-year. The derived 90% confidence level upper limits exclude a DM-electron scattering cross section above 6.4 $\times$ 10$^{-33}$ cm$^2$ for a DM mass of 0.25 GeV, assuming a light mediator; and above 3.4 $\times$ 10$^{-37}$ cm$^2$ for a 0.4 GeV DM, assuming a heavy mediator, and represent the most stringent constraints for a NaI(Tl) target to date. We also briefly discuss a planned analysis using an annual modulation method below the current 0.7 keV threshold of COSINE-100, down to few photoelectrons yield.

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N. Carlin, J. Y. Cho, S. J. Cho, S. Choi, A. C. Ezeribe, L. E. Franca, O. Gileva, C. Ha, I. S. Hahn, S. J. Hollick, E. J. Jeon, H. W. Joo, W. G. Kang, M. Kauer, B. H. Kim, D. Y. Kim, H. J. Kim, J. Kim, K. W. Kim, S. H. Kim, S. K. Kim, W. K. Kim, Y. D. Kim, Y. H. Kim, B. R. Ko, 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, S. L. Olsen, H. K. Park, H. S. Park, J. C. Park, J. S. Park, K. S. Park, K. 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, G. H. Yu. 2025-10-02. Constraints on sub-GeV dark matter scattering on electrons with COSINE-100. https://doi.org/10.1103/kszv-g7tl

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