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Start Over Author "LUX Collaboration" Publisher escholarship, university of california
4 results on '"LUX Collaboration"'

1. Results of a Search for Sub-GeV Dark Matter Using 2013 LUX Data.

Author

Akerib, DS, Alsum, S, Araújo, HM, Bai, X, Balajthy, J, Beltrame, P, Bernard, EP, Bernstein, A, Biesiadzinski, TP, Boulton, EM, Boxer, B, Brás, P, Burdin, S, Byram, D, Carmona-Benitez, MC, Chan, C, Cutter, JE, Davison, TJR, Druszkiewicz, E, Fallon, SR, Fan, A, Fiorucci, S, Gaitskell, RJ, Genovesi, J, Ghag, C, Gilchriese, MGD, Gwilliam, C, Hall, CR, Haselschwardt, SJ, Hertel, SA, Hogan, DP, Horn, M, Huang, DQ, Ignarra, CM, Jacobsen, RG, Jahangir, O, Ji, W, Kamdin, K, Kazkaz, K, Khaitan, D, Knoche, R, Korolkova, EV, Kravitz, S, Kudryavtsev, VA, Lenardo, BG, Lesko, KT, Liao, J, Lin, J, Lindote, A, Lopes, MI, Manalaysay, A, Mannino, RL, Marangou, N, Marzioni, MF, McKinsey, DN, Mei, D-M, Moongweluwan, M, Morad, JA, Murphy, A St J, Naylor, A, Nehrkorn, C, Nelson, HN, Neves, F, Oliver-Mallory, KC, Palladino, KJ, Pease, EK, Riffard, Q, Rischbieter, GRC, Rhyne, C, Rossiter, P, 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, Utku, U, Uvarov, S, Velan, V, Webb, RC, White, JT, Whitis, TJ, Witherell, MS, Wolfs, FLH, Woodward, D, Xu, J, Yazdani, K, Zhang, C, and LUX Collaboration

Subjects
LUX Collaboration, astro-ph.CO, astro-ph.IM, hep-ex, physics.ins-det, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

The scattering of dark matter (DM) particles with sub-GeV masses off nuclei is difficult to detect using liquid xenon-based DM search instruments because the energy transfer during nuclear recoils is smaller than the typical detector threshold. However, the tree-level DM-nucleus scattering diagram can be accompanied by simultaneous emission of a bremsstrahlung photon or a so-called "Migdal" electron. These provide an electron recoil component to the experimental signature at higher energies than the corresponding nuclear recoil. The presence of this signature allows liquid xenon detectors to use both the scintillation and the ionization signals in the analysis where the nuclear recoil signal would not be otherwise visible. We report constraints on spin-independent DM-nucleon scattering for DM particles with masses of 0.4-5  GeV/c^{2} using 1.4×10^{4}  kg day of search exposure from the 2013 data from the Large Underground Xenon (LUX) experiment for four different classes of mediators. This analysis extends the reach of liquid xenon-based DM search instruments to lower DM masses than has been achieved previously.

Published
2019

2. Limits on Spin-Dependent WIMP-Nucleon Cross Section Obtained from the Complete LUX Exposure.

Author

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, Chiller, AA, Chiller, C, Currie, A, Cutter, JE, Davison, TJR, Dobi, A, Dobson, JEY, Druszkiewicz, E, Edwards, BN, Faham, CH, Fallon, SR, Fiorucci, S, Gaitskell, RJ, Gehman, VM, 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, D-M, Mock, J, Moongweluwan, M, Morad, JA, Murphy, A St J, 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, Stephenson, S, 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, and LUX Collaboration

Subjects
LUX Collaboration, astro-ph.CO, General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

We present experimental constraints on the spin-dependent WIMP-nucleon elastic cross sections from the total 129.5  kg yr exposure acquired by the Large Underground Xenon experiment (LUX), operating at the Sanford Underground Research Facility in Lead, South Dakota (USA). A profile likelihood ratio analysis allows 90% C.L. upper limits to be set on the WIMP-neutron (WIMP-proton) cross section of σ_{n}=1.6×10^{-41}  cm^{2} (σ_{p}=5×10^{-40}  cm^{2}) at 35  GeV c^{-2}, almost a sixfold improvement over the previous LUX spin-dependent results. The spin-dependent WIMP-neutron limit is the most sensitive constraint to date.

Published
2017

3. Improved modeling of β electronic recoils in liquid xenon using LUX calibration data

Author

The LUX Collaboration, Akerib, D. S., Alsum, S., Araújo, H. M., Bai, X., Balajthy, J., Baxter, A., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Boxer, B., Brás, P., Burdin, S., Byram, D., Carmona-Benitez, M. C., Chan, C., Cutter, J. E., de Viveiros, L., Druszkiewicz, E., Fan, A., Fiorucci, S., Gaitskell, R. J., Ghag, C., Gilchriese, M. G. D., Gwilliam, C., Hall, C. R., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Jacobsen, R. G., Jahangir, O., Ji, W., Kamdin, K., Kazkaz, K., Khaitan, D., Korolkova, E. V., Kravits, S., Kudryavtsev, V. A., Leason, E., Lenardo, B. G., Lesko, K. T., Liao, J., Lin, J., Lindote, A., Lopes, M. I., Manalaysay, A., Mannino, R. L., Marangou, N., Marzioni, M. F., McKinsey, D. N., Mei, D. M., Moongweluwan, M., Morad, J. A., Murphy, A. St. J., Naylor, A., Nehrkorn, C., Nelson, H. N., Neves, F., Nilima, A., Oliver-Mallory, K. C., Palladino, K. J., Pease, E. K., Riffard, Q., Rischbieter, G. R. C., Rhyne, C., Rossiter, P., Shaw, S., Shutt, T. A., Silva, C., Solmaz, M., Solovov, V. N., Sorensen, P., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, R., Taylor, W. C., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Utku, U., Uvarov, S., Vacheret, A., Velan, V., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Woodward, D., Xu, J., and Zhang, C.

Subjects
Physics - Instrumentation and Detectors, interaction of hadrons, Physics::Instrumentation and Detectors, with matter, Monte Carlo method, Dark matter, Extrapolation, Detector modelling and simulations I (interaction of radiation with matter, Noble liquid detectors, chemistry.chemical_element, Time projection Chambers, 01 natural sciences, High Energy Physics - Experiment, Recoil, Xenon, Engineering, 0103 physical sciences, Calibration, 010306 general physics, Dark Matter detectors, Instrumentation, physics.ins-det, Mathematical Physics, etc), Physics, Scintillation, 010308 nuclear & particles physics, hep-ex, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, interaction of photons with matter, Nuclear & Particles Physics, Computational physics, chemistry, Physical Sciences
Abstract

We report here methods and techniques for creating and improving a model that reproduces the scintillation and ionization response of a dual-phase liquid and gaseous xenon time-projection chamber. Starting with the recent release of the Noble Element Simulation Technique (NEST v2.0), electronic recoil data from the $\beta$ decays of ${}^3$H and ${}^{14}$C in the Large Underground Xenon (LUX) detector were used to tune the model, in addition to external data sets that allow for extrapolation beyond the LUX data-taking conditions. This paper also presents techniques used for modeling complicated temporal and spatial detector pathologies that can adversely affect data using a simplified model framework. The methods outlined in this report show an example of the robust applications possible with NEST v2.0, while also providing the final electronic recoil model and detector parameters that will used in the new analysis package, the LUX Legacy Analysis Monte Carlo Application (LLAMA), for accurate reproduction of the LUX data. As accurate background reproduction is crucial for the success of rare-event searches, such as dark matter direct detection experiments, the techniques outlined here can be used in other single-phase and dual-phase xenon detectors to assist with accurate ER background reproduction., Comment: 17 Pages, 10 Figures, 2 Tables

Published
2020

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

Author

The LUX Collaboration, Akerib, D. S., Alsum, S., Araújo, H. M., Bai, X., Bailey, A. J., Balajthy, J., Beltrame, P., Bernard, E. P., Bernstein, A., Biesiadzinski, T. P., Boulton, E. M., Brás, P., Byram, D., Carmona-Benitez, M. C., Chan, C., Currie, A., Cutter, J. E., Davison, T. J. R., Dobi, A., Druszkiewicz, E., Edwards, B. N., Fallon, S. R., Fan, A., Fiorucci, S., Gaitskell, R. J., Genovesi, J., Ghag, C., Gilchriese, M. G. D., Hall, C. R., Haselschwardt, S. J., Hertel, S. A., Hogan, D. P., Horn, M., Huang, D. Q., Ignarra, C. M., Jacobsen, R. G., Ji, W., Kamdin, K., Kazkaz, K., Khaitan, D., Knoche, R., Lenardo, B. G., Lesko, K. T., Liao, J., Lindote, A., Lopes, M. I., Manalaysay, A., Mannino, R. L., Marzioni, M. F., McKinsey, D. N., Mei, D. M., Mock, J., Moongweluwan, M., Morad, J. A., Murphy, A. St. J., Nehrkorn, C., Nelson, H. N., Neves, F., O'Sullivan, K., Oliver-Mallory, K. C., Palladino, K. J., Pease, E. K., Rhyne, C., Shaw, S., Shutt, T. A., Silva, C., Solmaz, M., Solovov, V. N., Sorensen, P., Sumner, T. J., Szydagis, M., Taylor, D. J., Taylor, W. C., Tennyson, B. P., Terman, P. A., Tiedt, D. R., To, W. H., Tripathi, M., Tvrznikova, L., Utku, U., Uvarov, S., Velan, V., Verbus, J. R., Webb, R. C., White, J. T., Whitis, T. J., Witherell, M. S., Wolfs, F. L. H., Xu, J., Yazdani, K., Young, S. K., and Zhang, C.

Subjects
Physics - Instrumentation and Detectors, ARGON, Physics::Instrumentation and Detectors, Dark matter, FOS: Physical sciences, chemistry.chemical_element, XMASS, NUCLEAR, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, RECOILS, 01 natural sciences, Atomic, Particle detector, Particle identification, Physics, Particles & Fields, Nuclear physics, LIMITS, Recoil, Xenon, Particle and Plasma Physics, SEARCH, 0103 physical sciences, Nuclear, 010306 general physics, physics.ins-det, Physics, Scintillation, Quantum Physics, Science & Technology, 010308 nuclear & particles physics, GAMMA-RAYS, Molecular, Instrumentation and Detectors (physics.ins-det), Nuclear & Particles Physics, KRYPTON, chemistry, Weakly interacting massive particles, Physical Sciences, Scintillation counter, Astronomical and Space Sciences
Abstract

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 2013-16 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 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., 16 pages, 11 figures

Published
2018

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