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Dark Matter Results from 100 Live Days of XENON100 Data

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arxiv 1104.2549 v3 pith:6I25XNSR submitted 2011-04-13 astro-ph.CO hep-ex

Dark Matter Results from 100 Live Days of XENON100 Data

XENON100 Collaboration: E. Aprile , K. Arisaka , F. Arneodo , A. Askin , L. Baudis , A. Behrens , K. Bokeloh , E. Brown
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T. Bruch G. Bruno J. M. R. Cardoso W.-T. Chen B. Choi D. Cline E. Duchovni S. Fattori A. D. Ferella F. Gao K.-L. Giboni E. Gross A. Kish C. W. Lam J. Lamblin R. F. Lang C. Levy K. E. Lim Q. Lin S. Lindemann M. Lindner J. A. M. Lopes K. Lung T. Marrodan Undagoitia Y. Mei A. J. Melgarejo Fernandez K. Ni U. Oberlack S. E. A. Orrigo E. Pantic R. Persiani G. Plante A. C. C. Ribeiro R. Santorelli J. M. F. dos Santos G. Sartorelli M. Schumann M. Selvi P. Shagin H. Simgen A. Teymourian D. Thers O. Vitells H. Wang M. Weber C. Weinheimer
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We present results from the direct search for dark matter with the XENON100 detector, installed underground at the Laboratori Nazionali del Gran Sasso of INFN, Italy. XENON100 is a two-phase time projection chamber with a 62 kg liquid xenon target. Interaction vertex reconstruction in three dimensions with millimeter precision allows to select only the innermost 48 kg as ultra-low background fiducial target. In 100.9 live days of data, acquired between January and June 2010, no evidence for dark matter is found. Three candidate events were observed in a pre-defined signal region with an expected background of 1.8 +/- 0.6 events. This leads to the most stringent limit on dark matter interactions today, excluding spin-independent elastic WIMP-nucleon scattering cross-sections above 7.0x10^-45 cm^2 for a WIMP mass of 50 GeV/c^2 at 90% confidence level.

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