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arxiv 1507.07748 v1 pith:Z7ZYEGDX submitted 2015-07-28 astro-ph.CO hep-exphysics.ins-det

Search for Event Rate Modulation in XENON100 Electronic Recoil Data

The XENON Collaboration: E. Aprile , J. Aalbers , F. Agostini , M. Alfonsi , M. Anthony , L. Arazi , K. Arisaka , F. Arneodo
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C. Balan P. Barrow L. Baudis B. Bauermeister P. A. Breur A. Brown E. Brown S. Bruenner G. Bruno R. Budnik L. Buetikofer J. M. R. Cardoso M. Cervantes D. Coderre A. P. Colijn H. Contreras J. P. Cussonneau M. P. Decowski P. de Perio A. Di Giovanni E. Duchovni S. Fattori A. D. Ferella A. Fieguth W. Fulgione F. Gao M. Garbini C. Geis L. W. Goetzke C. Grignon E. Gross W. Hampel C. Hasterok R. Itay F. Kaether B. Kaminsky G. Kessler A. Kish H. Landsman R. F. Lang M. Le Calloch D. Lellouch L. Levinson C. Levy S. Lindemann M. Lindner J. A. M. Lopes A. Lyashenko S. Macmullin T. Marrodan Undagoitia J. Masbou F. V. Massoli D. Mayani A. J. Melgarejo Fernandez. Y. Meng M. Messina K. Micheneau B. Miguez A. Molinario M. Murra J. Naganoma K. Ni U. Oberlack S. E. A. Orrigo P. Pakarha R. Persiani F. Piastra J. Pienaar G. Plante N. Priel L. Rauch S. Reichard C. Reuter A. Rizzo S. Rosendahl J. M. F. dos Santos G. Sartorelli S. Schindler J. Schreiner M. Schumann L. Scotto Lavina M. Selvi P. Shagin H. Simgen A. Teymourian D. Thers A. Tiseni G. Trinchero C. Tunnell R. Wall H. Wang M. Weber C. Weinheimer Y. Zhang
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classification astro-ph.CO hep-exphysics.ins-det
keywords modulationsigmaanalysisannualdarkdatadaysdetector
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have searched for periodic variations of the electronic recoil event rate in the (2-6) keV energy range recorded between February 2011 and March 2012 with the XENON100 detector, adding up to 224.6 live days in total. Following a detailed study to establish the stability of the detector and its background contributions during this run, we performed an un-binned profile likelihood analysis to identify any periodicity up to 500 days. We find a global significance of less than 1 sigma for all periods suggesting no statistically significant modulation in the data. While the local significance for an annual modulation is 2.8 sigma, the analysis of a multiple-scatter control sample and the phase of the modulation disfavor a dark matter interpretation. The DAMA/LIBRA annual modulation interpreted as a dark matter signature with axial-vector coupling of WIMPs to electrons is excluded at 4.8 sigma.

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