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Direct dark matter search by annual modulation with 2.7 years of XMASS-I data

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Title
Direct dark matter search by annual modulation with 2.7 years of XMASS-I data
Author(s)
Abe K.; Hiraide K.; Ichimura K.; Kishimoto Y.; Kobayashi K.; Kobayashi M.; Moriyama S.; Nakahata M.; Norita T.; Ogawa H.; Sato K.; Sekiya H.; Takachio O.; Takeda A.; Tasaka S.; Yamashita M.; Yang B.S.; Nam Young Kim; Yeongduk Kim; Itow Y.; Kanzawa K.; Kegasa R.; Masuda K.; Takiya H.; Fushimi K.; Kanzaki G.; Martens K.; Suzuki Y.; Xu B.D.; Fujita R.; Hosokawa K.; Miuchi K.; Oka N.; Takeuchi Y.; Yong Hamb Kim; Lee K.B.; Lee M.K.; Fukuda Y.; Miyasaka M.; Nishijima K.; Nakamura S.; XMASS Collaboration
Publication Date
2018-05
Journal
PHYSICAL REVIEW D, v.97, no.10, pp.102006 -
Publisher
American Physical Society
Abstract
An annual modulation signal due to the Earth orbiting around the Sun would be one of the strongest indications of the direct detection of dark matter. In 2016, we reported a search for dark matter by looking for this annual modulation with our single-phase liquid xenon XMASS-I detector. That analysis resulted in a slightly negative modulation amplitude at low energy. In this work, we included more than one year of additional data, which more than doubles the exposure to 800 live days with the same 832 kg target mass. When we assume weakly interacting massive particle (WIMP) dark matter elastically scattering on the xenon target, the exclusion upper limit for the WIMP-nucleon cross section was improved by a factor of 2 to 1.9×10-41 cm2 at 8 GeV/c2 at 90% confidence level with our newly implemented data selection through a likelihood method. For the model-independent case, without assuming any specific dark matter model, we obtained more consistency with the null hypothesis than before with a p-value of 0.11 in the 1-20 keV energy region. This search probed this region with an exposure that was larger than that of DAMA/LIBRA. We also did not find any significant amplitude in the data for periodicity with periods between 50 and 600 days in the energy region between 1 to 6 keV. © 2018 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/5278
ISSN
2470-0010
Appears in Collections:
Center for Underground Physics(지하실험 연구단) > Journal Papers (저널논문)
Files in This Item:
PhysRevD.97.102006.pdfDownload

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