Journal
PHYSICS LETTERS B
Volume 795, Issue -, Pages 308-313Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2019.06.022
Keywords
Sub-GeV dark matter; Annual modulation; Liquid xenon
Funding
- Japanese Ministry of Education, Culture, Sports, Science and Technology
- Institute for Cosmic Ray Research (ICRR), the University of Tokyo
- JSPS KAKENHI [19GS0204, 26104004, 16H03973, 17J07032]
- National Research Foundation of Korea - Korean Government [NRF-2011-220-C00006]
- Institute for Basic Science [IBS-R017-G1-2018-a00]
- Grants-in-Aid for Scientific Research [17J07032, 16H03973] Funding Source: KAKEN
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A search for dark matter (DM) with mass in the sub-GeV region (0.32-1 GeV) was conducted by looking for an annual modulation signal in XMASS, a single-phase liquid xenon detector. Inelastic nuclear scattering accompanied by bremsstrahlung emission was used to search down to an electron equivalent energy of 1 keV. The data used had a live time of 2.8 years (3.5 years in calendar time), resulting in a total exposure of 2.38 ton-years. No significant modulation signal was observed and 90% confidence level upper limits of 1.6 x 10(-33) cm(2) at 0.5 GeV was set for the DM-nucleon cross section. This is the first experimental result of a search for DM mediated by the bremsstrahlung effect. In addition, a search for DM with mass in the multi-GeV region (4-20 GeV) was conducted with a lower energy threshold than previous analysis of XMASS. Elastic nuclear scattering was used to search down to a nuclear recoil equivalent energy of 2.3 keV, and upper limits of 2.9 x10(-42) cm(2) at 8 GeV was obtained. (C) 2019 The Author. Published by Elsevier B.V.
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