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Direct dark matter search by annual modulation in XMASS-I

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Title
Direct dark matter search by annual modulation in XMASS-I
Author(s)
Abe K.; Hiraide K.; Ichimura K.; Kishimoto Y.; Kobayashi K.; Kobayashi M.; Moriyama S.; Nakahata M.; Norita T.; Ogawa H.; Sekiya H.; Takachio O.; Takeda A.; Yamashita M.; Yang B.S.; N.Y. Kim; Y.D. Kim; Tasaka S.; Fushimi K.; Liu J.; Martens K.; Suzuki Y.; Xu B.D.; Fujita R.; Hosokawa K.; Miuchi K.; Onishi Y.; Oka N.; Takeuchi Y.; Y.H. Kim; Lee J.S.; Lee K.B.; Lee M.K.; Fukuda Y.; Itow Y.; Kegasa R.; Kobayashi K.; Masuda K.; Takiya H.; Nishijima K.; Nakamura S.
Publication Date
2016-08
Journal
PHYSICS LETTERS B, v.759, no., pp.272 - 276
Publisher
ELSEVIER SCIENCE BV
Abstract
A search for dark matter was conducted by looking for an annual modulation signal due to the Earth's rotation around the Sun using XMASS, a single phase liquid xenon detector. The data used for this analysis was 359.2 live days times 832 kg of exposure accumulated between November 2013 and March 2015. When we assume Weakly Interacting Massive Particle (WIMP) dark matter elastically scattering on the target nuclei, the exclusion upper limit of the WIMP-nucleon cross section 4.3×10-41 cm2 at 8 GeV/c2 was obtained and we exclude almost all the DAMA/LIBRA allowed region in the 6 to 16 GeV/c2 range at ~10-40 cm2. The result of a simple modulation analysis, without assuming any specific dark matter model but including electron/γ events, showed a slight negative amplitude. The p-values obtained with two independent analyses are 0.014 and 0.068 for null hypothesis, respectively. We obtained 90% C.L. upper bounds that can be used to test various models. This is the first extensive annual modulation search probing this region with an exposure comparable to DAMA/LIBRA. © 2016 The Author(s)
URI
http://pr.ibs.re.kr/handle/8788114/2598
DOI
10.1016/j.physletb.2016.05.081
ISSN
0370-2693
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
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