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arxiv 1207.5988 v2 pith:5DSXZCCE submitted 2012-07-25 astro-ph.CO hep-exhep-phphysics.ins-det

Dark Matter Results from 225 Live Days of XENON100 Data

XENON100 Collaboration: E. Aprile , M. Alfonsi , K. Arisaka , F. Arneodo , C. Balan , L. Baudis , B. Bauermeister , A. Behrens
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P. Beltrame K. Bokeloh E. Brown G. Bruno R. Budnik J. M. R. Cardoso W.-T. Chen B. Choi D. Cline A. P. Colijn H. Contreras J. P. Cussonneau M. P. Decowski E. Duchovni S. Fattori A. D. Ferella W. Fulgione F. Gao M. Garbini C. Ghag K.-L. Giboni L. W. Goetzke C. Grignon E. Gross W. Hampel F. Kaether H. Kettling A. Kish J. Lamblin H. Landsman R. F. Lang M. Le Calloch C. Levy K. E. Lim Q. Lin S. Lindemann M. Lindner J. A. M. Lopes K. Lung T. Marrodan Undagoitia F. V. Massoli A. J. Melgarejo Fernandez Y. Meng A. Molinario E. Nativ K. Ni U. Oberlack S. E. A. Orrigo E. Pantic R. Persiani G. Plante N. Priel A. Rizzo S. Rosendahl J. M. F. dos Santos G. Sartorelli J. Schreiner M. Schumann L. Scotto Lavina P. R. Scovell M. Selvi P. Shagin H. Simgen A. Teymourian D. Thers O. Vitells H. Wang M. Weber C. Weinheimer
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classification astro-ph.CO hep-exhep-phphysics.ins-det
keywords darkenergyeventsmattertimesxenon100analysisbackground
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 \pm 0.6) \times 10^-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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