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Dark Matter Results from 225 Live Days of XENON100 Data

Abstract : We report on a search for particle dark matter with the XENON100 experiment, operated at the Laboratori Nazionali del Gran Sasso (LNGS) for 13 months during 2011 and 2012. XENON100 features an ultra-low electromagnetic background of (5.3\pm0.6)\times10^-3 events (kg day keVee)^-1 in the energy region of interest. A blind analysis of 224.6 live days \times 34 kg exposure has yielded no evidence for dark matter interactions. The two candidate events observed in the pre-defined nuclear recoil energy range of 6.6-30.5 keVnr are consistent with the background expectation of (1.0 \pm 0.2) events. A Profile Likelihood analysis using a 6.6-43.3 keVnr energy range sets the most stringent limit on the spin-independent elastic WIMP-nucleon scattering cross section for WIMP masses above 8 GeV/c^2, with a minimum of 2 \times 10^-45 cm^2 at 55 GeV/c^2 and 90% confidence level.
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Submitted on : Monday, July 30, 2012 - 11:14:27 AM
Last modification on : Thursday, August 5, 2021 - 2:40:01 PM

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E. Aprile, M. Alfonsi, K. Arisaka, F. Arneodo, C. Balan, et al.. Dark Matter Results from 225 Live Days of XENON100 Data. Physical Review Letters, American Physical Society, 2012, 109, pp.181301. ⟨10.1103/PhysRevLett.109.181301⟩. ⟨in2p3-00721741⟩

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