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Low-mass dark matter search results from full exposure of PandaX-I experiment

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arxiv 1505.00771 v3 pith:ND2OZRCF submitted 2015-05-04 hep-ex astro-ph.IMphysics.ins-det

Low-mass dark matter search results from full exposure of PandaX-I experiment

classification hep-ex astro-ph.IMphysics.ins-det
keywords wimplow-masspandax-imassdarkexperimentexposurefull
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report the results of a weakly-interacting massive particle (WIMP) dark matter search using the full 80.1\;live-day exposure of the first stage of the PandaX experiment (PandaX-I) located in the China Jin-Ping Underground Laboratory. The PandaX-I detector has been optimized for detecting low-mass WIMPs, achieving a photon detection efficiency of 9.6\%. With a fiducial liquid xenon target mass of 54.0\,kg, no significant excess event were found above the expected background. A profile likelihood analysis confirms our earlier finding that the PandaX-I data disfavor all positive low-mass WIMP signals reported in the literature under standard assumptions. A stringent bound on the low mass WIMP is set at WIMP mass below 10\,GeV/c$^2$, demonstrating that liquid xenon detectors can be competitive for low-mass WIMP searches.

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