The growing interest in the interactions between dark matter particles and electrons has received a further boost by the observation of an excess in electron recoil events in the XENON1T experiment. Of particular interest are dark matter models in which the scattering process is inelastic, such that the ground state can upscatter into an excited state. The subsequent exothermic downscattering of such excited states on electrons can lead to observable signals in direct detection experiments and gives a good fit to the XENON1T excess. In this work, we study terrestrial upscattering, i.e. inelastic scattering of dark matter particles on nuclei in the Earth, as a plausible origin of such excited states. Using both analytical and Monte Carlo methods, we obtain detailed predictions of their density and velocity distribution. These results enable us to explore the time dependence of the flux of excited states resulting from the rotation of the Earth. For the case of XENON1T, we find the resulting daily modulation of the electron recoil signal to be at the level of 10% with a strong dependence on the dark matter mass.
Sub-MeV gamma-ray lines from an endothermic interpretation of the LZ recoil candidate
Southeastern Universities Research Association (SURA)（东南大学研究协会）；NASA Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；International Institute of Physics, Federal University of Rio Grande do Norte（北里奥格兰德联邦大学物理国际研究所）；Observatório Nacional（国家天文台）
本文提出重暗物质内热上散射解释 LZ 高能核反冲候选事件，并指出其辐射衰变产生亚 MeV 伽马射线线，可被 COSI 探测，为验证该解释提供机会。
Inelastic Dark Matter Signature at High Recoil Energy in LUX-ZEPLIN and CRESST
Karlsruhe Institute of Technology (KIT)（卡尔斯鲁厄理工学院）；Henan Normal University（河南师范大学）；Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）；Nanjing Normal University（南京师范大学）
A Peccei-Quinn Origin for Inelastic Electroweak Dark Matter after LUX-ZEPLIN
Università degli Studi di Salerno（萨莱诺大学）；Istituto Nazionale di Fisica Nucleare, Gruppo Collegato di Salerno, Sezione di Napoli（意大利国家核物理研究所，萨莱诺协作组，那不勒斯分部）
High-Energy Nuclear Recoils from Boosted Dark Matter for the LZ 248-keV Event: Beyond the Halo-Dependent High-Velocity Tail
Jazan University（扎赞大学）；University of South Dakota（南达科他大学）；University of Kansas（堪萨斯大学）；Chungnam National University（忠南国立大学）；Jeonbuk National University（全北国立大学）；Korea Institute for Advanced Study（韩国高等研究院）；Institute for Basic Science（基础科学研究院）
New Constraints on Cosmic-ray boosted Sub-GeV Dark Matter via Light Mediators
Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台暗物质与空间天文重点实验室）；School of Astronomy and Space Science, University of Science and Technology of China（中国科学技术大学天文与空间科学学院）
Exothermic dark matter and the 248 keV nuclear recoil in LUX-ZEPLIN
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma（俄克拉荷马大学霍默·L·道奇物理与天文学系）；Department of Physics, University of Wisconsin–Madison（威斯康星大学麦迪逊分校物理系）
Discriminating Dark Matter Origins with Directional Detection
ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Melbourne（墨尔本大学物理学院暗物质粒子物理卓越研究中心）；ARC Centre of Excellence for Dark Matter Particle Physics, School of Physics, The University of Sydney（悉尼大学物理学院暗物质粒子物理卓越研究中心）
