A direct dark matter search in XMASS-I
XMASS Collaboration: K. Abe, K. Hiraide, K. Ichimura, Y. Kishimoto, K., Kobayashi, M. Kobayashi, S. Moriyama, M. Nakahata, T. Norita, H. Ogawa, K., Sato, H. Sekiya, O. Takachio, A. Takeda, S. Tasaka, M. Yamashita, B.S. Yang,, N.Y. Kim, Y.D. Kim, Y. Itow, K. Kanzawa, R. Kegasa

TL;DR
This paper reports a direct search for dark matter WIMPs using a liquid xenon detector at Kamioka, setting the most stringent upper limit on the WIMP-nucleon cross section among single-phase xenon detectors.
Contribution
First to conduct a long-term dark matter search with a single-phase liquid xenon detector at Kamioka, providing new upper limits on WIMP interactions.
Findings
No excess events observed above background.
Set an upper limit of 2.2 x 10^-44 cm^2 on WIMP-nucleon cross section.
Achieved the most stringent limit among similar detectors.
Abstract
A search for dark matter using an underground single-phase liquid xenon detector was conducted at the Kamioka Observatory in Japan, particularly for Weakly Interacting Massive Particles (WIMPs). We have used 705.9 live days of data in a fiducial volume containing 97 kg of liquid xenon at the center of the detector. The event rate in the fiducial volume after the data reduction was at , with a signal efficiency of . All the remaining events are consistent with our background evaluation, mostly of the "mis-reconstructed events" originated from Pb in the copper plates lining the detector's inner surface. The obtained upper limit on a spin-independent WIMP-nucleon cross section was for a WIMP mass of at the …
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