Liquid xenon scintillation measurements and pulse shape discrimination in the LUX dark matter detector

被引:16
作者
Akerib, D. S. [1 ,2 ,3 ]
Alsum, S. [4 ]
Araujo, H. M. [5 ]
Bai, X. [6 ]
Bailey, A. J. [5 ]
Balajthy, J. [7 ]
Beltrame, P. [8 ]
Bernard, E. P. [9 ,10 ]
Bernstein, A. [11 ]
Biesiadzinski, T. P. [1 ,2 ,3 ]
Boulton, E. M. [9 ,10 ,12 ]
Bras, P. [13 ]
Byram, D. [14 ,15 ]
Carmona-Benitez, M. C. [14 ,16 ,17 ]
Chan, C. [18 ]
Currie, A. [5 ]
Cutter, J. E. [19 ]
Davison, T. J. R. [8 ]
Dobi, A. [12 ]
Druszkiewicz, E. [20 ]
Edwards, B. N. [10 ]
Fallon, S. R. [21 ]
Fan, A. [2 ,3 ]
Fiorucci, S. [12 ,18 ]
Gaitskell, R. J. [18 ]
Genovesi, J. [21 ]
Ghag, C. [22 ]
Gilchriese, M. G. D. [12 ]
Hall, C. R. [7 ]
Haselschwardt, S. J. [17 ]
Hertel, S. A. [10 ,12 ,23 ,24 ]
Hogan, D. P. [9 ]
Horn, M. [9 ,10 ,15 ]
Huang, D. Q. [18 ]
Ignarra, C. M. [2 ,3 ]
Jacobsen, R. G. [9 ]
Ji, W. [1 ,2 ,3 ]
Kamdin, K. [9 ]
Kazkaz, K. [11 ]
Khaitan, D. [20 ]
Knoche, R. [7 ]
Lenardo, B. G. [11 ,19 ,25 ]
Lesko, K. T. [12 ]
Liao, J. [18 ]
Lindote, A. [13 ]
Lopes, M. I. [13 ]
Manalaysay, A. [19 ]
Mannino, R. L. [4 ,26 ]
Marzioni, M. F. [8 ]
McKinsey, D. N. [9 ,10 ,12 ]
机构
[1] Case Western Reserve Univ, Dept Phys, 10900 Euclid Ave, Cleveland, OH 44106 USA
[2] SLAC Natl Accelerator Lab, 2575 Sand Hill Rd, Menlo Pk, CA 94205 USA
[3] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, 452 Lomita Mall, Stanford, CA 94309 USA
[4] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA
[5] Imperial Coll London, Blackett Lab, High Energy Phys, London SW7 2BZ, England
[6] South Dakota Sch Mines & Technol, 501 East St,Joseph St, Rapid City, SD 57701 USA
[7] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[8] Univ Edinburgh, Sch Phys & Astron, SUPA, Edinburgh EH9 3FD, Midlothian, Scotland
[9] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[10] Yale Univ, Dept Phys, 217 Prospect St, New Haven, CT 06511 USA
[11] Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94551 USA
[12] Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA
[13] Univ Coimbra, Dept Phys, LIP Coimbra, Rua Larga, P-3004516 Coimbra, Portugal
[14] Univ South Dakota, Dept Phys, 414E Clark St, Vermillion, SD 57069 USA
[15] South Dakota Sci & Technol Author, Sanford Underground Res Facil, Lead, SD 57754 USA
[16] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA
[17] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA
[18] Brown Univ, Dept Phys, 182 Hope St, Providence, RI 02912 USA
[19] Univ Calif Davis, Dept Phys, One Shields Ave, Davis, CA 95616 USA
[20] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
[21] SUNY Albany, Dept Phys, 1400 Washington Ave, Albany, NY 12222 USA
[22] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England
[23] Univ Massachusetts, Amherst Ctr Fundamental Interact, Amherst, MA 01003 USA
[24] Dept Phys, Amherst, MA 01003 USA
[25] Stanford Univ, Dept Phys, 382 Via Pueblo, Stanford, CA 94305 USA
[26] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA
[27] Calif State Univ Stanislaus, Dept Phys, 1 Univ Circle, Turlock, CA 95382 USA
基金
美国国家科学基金会;
关键词
GAMMA-RAYS; ARGON; RECOILS; KRYPTON; NUCLEAR; SEARCH; LIMITS;
D O I
10.1103/PhysRevD.97.112002
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Weakly interacting massive particles (WIMPs) are a leading candidate for dark matter and are expected to produce nuclear recoil (NR) events within liquid xenon time-projection chambers. We present a measurement of the scintillation timing characteristics of liquid xenon in the LUX dark matter detector and develop a pulse shape discriminant to be used for particle identification. To accurately measure the timing characteristics, we develop a template-fitting method to reconstruct the detection times of photons. Analyzing calibration data collected during the 2013-2016 LUX WIMP search, we provide a new measurement of the singlet-to-triplet scintillation ratio for electron recoils (ER) below 46 keV, and we make, to our knowledge, a first-ever measurement of the NR singlet-to-triplet ratio at recoil energies below 74 keV. We exploit the difference of the photon time spectra for NR and ER events by using a prompt fraction discrimination parameter, which is optimized using calibration data to have the least number of ER events that occur in a 50% NR acceptance region. We then demonstrate how this discriminant can be used in conjunction with the charge-to-light discrimination to possibly improve the signal-to-noise ratio for nuclear recoils.
引用
收藏
页数:16
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