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Adhikari, G.; Carlin, N.; Choi, J. J.; Choi, S.; Ezeribe, A. C.; França, L. E.; Ha, C.; Hahn, I. S.; Hollick, S. J.; Jeon, E. J.; Jo, J. H.; Joo, H. W.; Kang, W. G.; Kauer, M.; Kim, 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.; Ko, Y. J.; Lee, 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.; Leonard, D. S.; Luan, N. T.; Manzato, B. B.; Maruyama, R. H.; Neal, R. J.; Nikkel, J. A.; Olsen, S. L.; Park, B. J.; Park, H. K.; Park, H. S.; Park, K. S.; Park, S. D.; Pitta, R. L. C.; Prihtiadi, H.; Ra, S. J.; Rott, C.; Shin, K. A.; Cavalcante, D. F. F. S.; Scarff, A.; Spooner, N. J. C.; Thompson, W. G.; Yang, L.; Yu, G. H.
Physical review letters, 11/2023, Volume: 131, Issue: 20Journal Article
We search for energetic electron recoil signals induced by boosted dark matter (BDM) from the galactic center using the COSINE-100 array of NaI(Tl) crystal detectors at the Yangyang Underground Laboratory. The signal would be an excess of events with energies above 4 MeV over the well-understood background. Because no excess of events are observed in a 97.7 kg·yr exposure, we set limits on BDM interactions under a variety of hypotheses. Notably, we explored the dark photon parameter space, leading to competitive limits compared to direct dark photon search experiments, particularly for dark photon masses below 4 MeV and considering the invisible decay mode. Furthermore, by comparing our results with a previous BDM search conducted by the Super-Kamionkande experiment, we found that the COSINE-100 detector has advantages in searching for low-mass dark matter. This analysis demonstrates the potential of the COSINE-100 detector to search for MeV electron recoil signals produced by the dark sector particle interactions.
