Calibration, event reconstruction, data analysis, and limit calculation for the LUX dark matter experiment

D. S. Akerib, S. Alsum, H. M. Araújo, X. Bai, A. J. Bailey, J. Balajthy, P. Beltrame, A. Bernstein, T. P. Biesiadzinski, E. M. Boulton, P. Brás, D. Byram, S. B. Cahn, M. C. Carmona-benitez, A. Currie, J. E. Cutter, T. J. R. Davison, A. Dobi, J. E. Y. Dobson, E. DruszkiewiczB. N. Edwards, C. H. Faham, S. R. Fallon, A. Fan, S. Fiorucci, R. J. Gaitskell, V. M. Gehman, J. Genovesi, M. G. D. Gilchriese, M. Hanhardt, S. J. Haselschwardt, S. A. Hertel, D. P. Hogan, M. Horn, D. Q. Huang, C. M. Ignarra, R. G. Jacobsen, W. Ji, K. Kamdin, K. Kazkaz, D. Khaitan, R. Knoche, N. A. Larsen, B. G. Lenardo, K. T. Lesko, A. Lindote, M. I. Lopes, A. Manalaysay, R. L. Mannino, M. F. Marzioni, D. N. Mckinsey, D.-m. Mei, J. Mock, M. Moongweluwan, J. A. Morad, A. St. J. Murphy, C. Nehrkorn, H. N. Nelson, F. Neves, K. O’sullivan, K. C. Oliver-mallory, K. J. Palladino, E. K. Pease, L. Reichhart, C. Rhyne, S. Shaw, T. A. Shutt, C. Silva, M. Solmaz, V. N. Solovov, P. Sorensen, T. J. Sumner, M. Szydagis, B. P. Tennyson, P. A. Terman, D. R. Tiedt, W. H. To, M. Tripathi, L. Tvrznikova, S. Uvarov, V. Velan, J. R. Verbus, R. C. Webb, T. J. Whitis, M. S. Witherell, F. L. H. Wolfs, K. Yazdani

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Abstract

The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits on the nuclear scattering cross sections for dark matter. Here, for results derived from 1.4×104  kg days of target exposure in 2013, details of the calibration, event-reconstruction, modeling, and statistical tests that underlie the results are presented. Detector performance is characterized, including measured efficiencies, stability of response, position resolution, and discrimination between electron- and nuclear-recoil populations. Models are developed for the drift field, optical properties, background populations, the electron- and nuclear-recoil responses, and the absolute rate of low-energy background events. Innovations in the analysis include in situ measurement of the photomultipliers’ response to xenon scintillation photons, verification of fiducial mass with a low-energy internal calibration source, and new empirical models for low-energy signal yield based on large-sample, in situ calibrations.
Original languageEnglish
Article number102008
Number of pages36
JournalPhysical Review D
Volume97
Issue number10
DOIs
Publication statusPublished - 31 May 2018

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