降低Cosine-100暗物质搜索中的能量阈值

论文标题

降低Cosine-100暗物质搜索中的能量阈值

Lowering the energy threshold in COSINE-100 dark matter searches

论文作者

Adhikari, G., de Souza, E. Barbosa, Carlin, 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.

论文摘要

Cosine-100是一个暗物质检测实验，它使用NAI（TL）晶体检测器自2016年9月起在韩国的Yangyang Underground Laboratory运行。其主要目标是测试使用同一目标介质的Dama/Libra实验观察到的年度调制。最近，达玛/天秤座发布的数据降低到1 keV，并且在9.5 $σ$下仍观察到持续的年度调制行为。通过将电子后坐力的能量阈值降低到1 KEV，可以将余弦100的年度调制结果与Dama/Libra的年度调制结果以模型无关的方式进行比较。此外，事件选择方法使用恒定速率研究提供了对几个至子GEV暗物质粒子的访问。在本文中，我们讨论了Cosine-100事件选择算法，其验证以及接近阈值的效率。

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$σ$. 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.

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