Showing papers by "A. Dobi published in 2014"
Case Western Reserve University1, Imperial College London2, South Dakota School of Mines and Technology3, University of Maryland, College Park4, Yale University5, Lawrence Livermore National Laboratory6, University of South Dakota7, University of California, Santa Barbara8, Brown University9, University of Coimbra10, University of Edinburgh11, University of Rochester12, Lawrence Berkeley National Laboratory13, University of California, Davis14, University College London15, University of California, Berkeley16, Texas A&M University17, Harvard University18
TL;DR: The first WIMP search data set is reported, taken during the period from April to August 2013, presenting the analysis of 85.3 live days of data, finding that the LUX data are in disagreement with low-mass W IMP signal interpretations of the results from several recent direct detection experiments.
Abstract: The Large Underground Xenon (LUX) experiment is a dual-phase xenon time-projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota). The LUX cryostat was filled for the first time in the underground laboratory in February 2013. We report results of the first WIMP search data set, taken during the period from April to August 2013, presenting the analysis of 85.3 live days of data with a fiducial volume of 118 kg. A profile-likelihood analysis technique shows our data to be consistent with the background-only hypothesis, allowing 90% confidence limits to be set on spin-independent WIMP-nucleon elastic scattering with a minimum upper limit on the cross section of 7.6 × 10(-46) cm(2) at a WIMP mass of 33 GeV/c(2). We find that the LUX data are in disagreement with low-mass WIMP signal interpretations of the results from several recent direct detection experiments.
1,962 citations
Indiana University1, University of Bern2, University of Alabama3, Stanford University4, Laurentian University5, Colorado State University6, University of Massachusetts Amherst7, University of Maryland, College Park8, Drexel University9, Carleton University10, Technische Universität München11, Seoul National University12, University of Illinois at Urbana–Champaign13, California Institute of Technology14
TL;DR: In this paper, an improved measurement of the 2νββ half-life performed by EXO-200 is reported, which is the most precisely measured half- life of any 2ν ββ decay to date.
Abstract: We report on an improved measurement of the 2νββ half-life of ^(136)Xe performed by EXO-200. The use of a large and homogeneous time-projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systematic uncertainty. We also discuss in detail the data-analysis methods used for double-β decay searches with EXO-200, while emphasizing those directly related to the present measurement. The ^(136)Xe 2νββ half-life is found to be T^(2νββ)_(1/2) = 2.165±0.016(stat)±0.059(sys)×10^(21) yr. This is the most precisely measured half-life of any 2νββ decay to date.
151 citations
Posted Content•
TL;DR: LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment.
Abstract: LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment. The initial null-result limit on the spin-independent WIMP-nucleon scattering cross-section was released in October 2013, with a primary scintillation threshold of 2 phe, roughly 3 keVnr for LUX. The detector has been deployed at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, and is the first experiment to achieve a limit on the WIMP cross-section lower than $10^{-45}$ cm$^{2}$. Here we present a more in-depth discussion of the novel energy scale employed to better understand the nuclear recoil light and charge yields, and of the calibration sources, including the new internal tritium source. We found the LUX data to be in conflict with low-mass WIMP signal interpretations of other results.
78 citations
Journal Article•
TL;DR: LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment as mentioned in this paper.
Abstract: LUX, the world's largest dual-phase xenon time-projection chamber, with a fiducial target mass of 118 kg and 10,091 kg-days of exposure thus far, is currently the most sensitive direct dark matter search experiment. The initial null-result limit on the spin-independent WIMP-nucleon scattering cross-section was released in October 2013, with a primary scintillation threshold of 2 phe, roughly 3 keVnr for LUX. The detector has been deployed at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, and is the first experiment to achieve a limit on the WIMP cross-section lower than $10^{-45}$ cm$^{2}$. Here we present a more in-depth discussion of the novel energy scale employed to better understand the nuclear recoil light and charge yields, and of the calibration sources, including the new internal tritium source. We found the LUX data to be in conflict with low-mass WIMP signal interpretations of other results.
5 citations
01 Jan 2014
TL;DR: Akerib et al. as discussed by the authors presented results from and current status of the LUX experiment, as well as plans for a follow-on, multi-ton-scale xenon experiment at SURF.
Abstract: Author(s): Akerib, DS; Araujo, HM; Bai, X; Bailey, AJ; Balajthy, J; Bernard, E; Bernstein, A; Bradley, A; Byram, D; Cahn, SB; Carmona-Benitez, MC; Chan, C; Chapman, JJ; Chiller, AA; Chiller, C; Coffey, T; Currie, A; De Viveiros, L; Dobi, A; Dobson, J; Druszkiewicz, E; Edwards, B; Faham, CH; Fiorucci, S; Flores, C; Gaitskell, RJ; Gehman, VM; Ghag, C; Gibson, KR; Gilchriese, MGD; Hall, C; Hertel, SA; Horn, M; Huang, DQ; Ihm, M; Jacobsen, RG; Kazkaz, K; Knoche, R; Larsen, NA; Lee, C; Lenardo, B; Lesko, KT; Lindote, A; Lopes, MI; Malling, DC; Man-Nino, R; McKinsey, DN; Mei, DM; Mock, J; Moongweluwan, M; Morad, J; Murphy, ASJ; Nehrkorn, C; Nelson, H; Neves, F; Ott, RA; Pangilinan, M; Parker, PD; Pease, EK; Pech, K; Phelps, P; Reichhart, L; Shutt, T; Silva, C; Solovov, VN; Sorensen, P; O'Sullivan, K; Sumner, TJ; Szydagis, M; Tay-Lor, D; Tennyson, B; Tiedt, DR; Tripathi, M; Uvarov, S; Verbus, JR; Walsh, N; Webb, R; White, JT; Witherell, MS; Wolfs, FLH; Woods, M; Zhang, C | Abstract: The search for dark matter reaches back generations and remains one of the most compelling endeavors in the hunt for physics beyond the Standard Model. Experiments attempting to directly detect WIMP dark matter have made re-markable progress in increasing sensitivity to elastic scattering of WIMPs on nuclei. The LUX experiment is a 370-kg, two-phase, xenon TPC currently running at SURF, 4850 feet below Lead, SD. LUX recently completed its first science run and was sensitive to spin independent WIMP scattering at cross sections below 10-45 cm2 for WIMP masses of approximately 20 to 80 GeV. Preparations for the final science run of LUX are currently underway, with final results expected in 2015. We will present results from and current status of the LUX experiment, as well as plans for a follow-on, multi-ton-scale xenon experiment at SURF.
1 citations