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

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 11期

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

页数：16

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