@article{8462056df79f4beb98ebd99b1f38cf95,
title = "Search for sub-GeV dark matter by annual modulation using XMASS-I detector",
abstract = "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 1.6×10−33 cm2 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 ×10−42 cm2 at 8 GeV was obtained.",
keywords = "Annual modulation, Liquid xenon, Sub-GeV dark matter",
author = "M. Kobayashi and K. Abe and K. Hiraide and K. Ichimura and Y. Kishimoto and K. Kobayashi and S. Moriyama and M. Nakahata and H. Ogawa and K. Sato and H. Sekiya and T. Suzuki and A. Takeda and S. Tasaka and M. Yamashita and Yang, {B. S.} and Kim, {N. Y.} and Kim, {Y. D.} and Y. Itow and K. Kanzawa and K. Masuda and K. Martens and Y. Suzuki and Xu, {B. D.} and K. Miuchi and N. Oka and Y. Takeuchi and Kim, {Y. H.} and Lee, {K. B.} and Lee, {M. K.} and Y. Fukuda and M. Miyasaka and K. Nishijima and K. Fushimi and G. Kanzaki and S. Nakamura",
note = "Funding Information: We gratefully acknowledge the cooperation of Kamioka Mining and Smelting Company. This work was supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology , the joint research program of the Institute for Cosmic Ray Research (ICRR), the University of Tokyo , Grant-in-Aid for Scientific Research, JSPS KAKENHI Grant Number, 19GS0204 , 26104004 , 16H03973 , 17J07032 , partially by the National Research Foundation of Korea Grant funded by the Korean Government ( NRF-2011-220-C00006 ) and Institute for Basic Science ( IBS-R017-G1-2018-a00 ). Funding Information: We gratefully acknowledge the cooperation of Kamioka Mining and Smelting Company. This work was supported by the Japanese Ministry of Education, Culture, Sports, Science and Technology, the joint research program of the Institute for Cosmic Ray Research (ICRR), the University of Tokyo, Grant-in-Aid for Scientific Research, JSPS KAKENHI Grant Number, 19GS0204, 26104004, 16H03973, 17J07032, partially by the National Research Foundation of Korea Grant funded by the Korean Government (NRF-2011-220-C00006) and Institute for Basic Science (IBS-R017-G1-2018-a00). Publisher Copyright: {\textcopyright} 2019 The Author",
year = "2019",
month = aug,
day = "10",
doi = "10.1016/j.physletb.2019.06.022",
language = "English",
volume = "795",
pages = "308--313",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",
}