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

  • Author(s): Akerib, DS;
  • Alsum, S;
  • Araújo, HM;
  • Bai, X;
  • Bailey, AJ;
  • Balajthy, J;
  • Beltrame, P;
  • Bernard, EP;
  • Bernstein, A;
  • Biesiadzinski, TP;
  • Boulton, EM;
  • Brás, P;
  • Byram, D;
  • Cahn, SB;
  • Carmona-Benitez, MC;
  • Chan, C;
  • Currie, A;
  • Cutter, JE;
  • Davison, TJR;
  • Dobi, A;
  • Dobson, JEY;
  • Druszkiewicz, E;
  • Edwards, BN;
  • Faham, CH;
  • Fallon, SR;
  • Fan, A;
  • Fiorucci, S;
  • Gaitskell, RJ;
  • Gehman, VM;
  • Genovesi, J;
  • Ghag, C;
  • Gilchriese, MGD;
  • Hall, CR;
  • Hanhardt, M;
  • Haselschwardt, SJ;
  • Hertel, SA;
  • Hogan, DP;
  • Horn, M;
  • Huang, DQ;
  • Ignarra, CM;
  • Jacobsen, RG;
  • Ji, W;
  • Kamdin, K;
  • Kazkaz, K;
  • Khaitan, D;
  • Knoche, R;
  • Larsen, NA;
  • Lee, C;
  • Lenardo, BG;
  • Lesko, KT;
  • Lindote, A;
  • Lopes, MI;
  • Manalaysay, A;
  • Mannino, RL;
  • Marzioni, MF;
  • McKinsey, DN;
  • Mei, DM;
  • Mock, J;
  • Moongweluwan, M;
  • Morad, JA;
  • Murphy, ASJ;
  • Nehrkorn, C;
  • Nelson, HN;
  • Neves, F;
  • O'Sullivan, K;
  • Oliver-Mallory, KC;
  • Palladino, KJ;
  • Pease, EK;
  • Reichhart, L;
  • Rhyne, C;
  • Shaw, S;
  • Shutt, TA;
  • Silva, C;
  • Solmaz, M;
  • Solovov, VN;
  • Sorensen, P;
  • Sumner, TJ;
  • Szydagis, M;
  • Taylor, DJ;
  • Taylor, WC;
  • Tennyson, BP;
  • Terman, PA;
  • Tiedt, DR;
  • To, WH;
  • Tripathi, M;
  • Tvrznikova, L;
  • Uvarov, S;
  • Velan, V;
  • Verbus, JR;
  • Webb, RC;
  • White, JT;
  • Whitis, TJ;
  • Witherell, MS;
  • Wolfs, FLH;
  • Xu, J;
  • Yazdani, K;
  • Young, SK;
  • Zhang, C
  • et al.
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.

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