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Phys Rev Lett. 2019 Apr 5;122(13):131802. doi: 10.1103/PhysRevLett.122.131802.

First Direct Search for Inelastic Boosted Dark Matter with COSINE-100.

Author information

Center for Underground Physics, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea.
Department of Physics, Sejong University, Seoul 05006, Republic of Korea.
Department of Physics and Wright Laboratory, Yale University, New Haven, Connecticut 06520, USA.
Physics Institute, University of São Paulo, 05508-090, São Paulo, Brazil.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
Department of Physics, Bandung Institute of Technology, Bandung 40132, Indonesia.
Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom.
Department of Science Education, Ewha Womans University, Seoul 03760, Republic of Korea.
Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea.
Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea.
Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea.
IBS School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
Department of Accelerator Science, Korea University, Sejong 30019, Republic of Korea.
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.


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.

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