Search for Event Rate Modulation in XENON100 Electronic Recoil Data

Abstract : 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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Physical Review Letters, American Physical Society, 2015, 115, pp.091302. 〈10.1103/PhysRevLett.115.091302〉
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http://hal.in2p3.fr/in2p3-01187280
Contributeur : Sylvie Flores <>
Soumis le : mercredi 26 août 2015 - 14:48:57
Dernière modification le : vendredi 22 juin 2018 - 09:29:11

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E. Aprile, J. Aalbers, F. Agostini, M. Alfonsi, M. Anthony, et al.. Search for Event Rate Modulation in XENON100 Electronic Recoil Data. Physical Review Letters, American Physical Society, 2015, 115, pp.091302. 〈10.1103/PhysRevLett.115.091302〉. 〈in2p3-01187280〉

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