Ha C, Adhikari G, Adhikari P, Barbosa de Souza E, Carlin N, Choi S, Djamal M, Ezeribe A C, Hahn I S, Jeon E J, Jo J H, Joo H W, Kang W G, Kang W, Kauer M, Kim G S, Kim H, Kim H J, Kim K W, Kim N Y, Kim S K, Kim Y D, Kim Y H, Ko Y J, Kudryavtsev V A, Lee H S, Lee J, Lee J Y, Lee M H, Leonard D S, Lynch W A, Maruyama R H, Mouton F, 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
Center for Underground Physics, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea.
Department of Physics, Sejong University, Seoul 05006, Republic of Korea.
Phys Rev Lett. 2019 Apr 5;122(13):131802. doi: 10.1103/PhysRevLett.122.131802.
A search for inelastic boosted dark matter (IBDM) using the COSINE-100 detector with 59.5 days of data is presented. This relativistic dark matter is theorized to interact with the target material through inelastic scattering with electrons, creating a heavier state that subsequently produces standard model particles, such as an electron-positron pair. In this study, we search for this electron-positron pair in coincidence with the initially scattered electron as a signature for an IBDM interaction. No excess over the predicted background event rate is observed. Therefore, we present limits on IBDM interactions under various hypotheses, one of which allows us to explore an area of the dark photon parameter space that has not yet been covered by other experiments. This is the first experimental search for IBDM using a terrestrial detector.
本文介绍了利用COSINE-100探测器，基于59.5天的数据对非弹性增强暗物质（IBDM）进行的搜索。这种相对论性暗物质理论上通过与电子的非弹性散射与靶物质相互作用，产生一个更重的状态，随后产生标准模型粒子，如电子-正电子对。在本研究中，我们搜索与初始散射电子符合的这种电子-正电子对，作为IBDM相互作用的一个特征。未观察到超过预测背景事件率的过量事件。因此，我们给出了各种假设下IBDM相互作用的限制，其中一个假设使我们能够探索暗光子参数空间中尚未被其他实验覆盖的区域。这是首次使用地面探测器对IBDM进行实验搜索。
