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Phys Rev Lett. 2014 Mar 7;112(9):091303. Epub 2014 Mar 4.

First results from the LUX dark matter experiment at the Sanford underground research facility.

Author information

1
Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA.
2
High Energy Physics, Imperial College London, Blackett Laboratory, London SW7 2BZ, United Kingdom.
3
South Dakota School of Mines and Technology, 501 East St Joseph Street, Rapid City, South Dakota 57701, USA.
4
Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
5
Department of Physics, Yale University, 217 Prospect Street, New Haven, Connecticut 06511, USA.
6
Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA.
7
Department of Physics, University of South Dakota, 414E Clark Street, Vermillion, South Dakota 57069, USA.
8
Department of Physics, Case Western Reserve University, 10900 Euclid Avenue, Cleveland, Ohio 44106, USA and Department of Physics, University of California Santa Barbara, Santa Barbara, California 93106, USA.
9
Department of Physics, Brown University, 182 Hope Street, Providence, Rhode Island 02912, USA.
10
LIP-Coimbra, Department of Physics, University of Coimbra, Rua Larga, 3004-516 Coimbra, Portugal.
11
SUPA, School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3JZ, United Kingdom.
12
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
13
Department of Physics, Brown University, 182 Hope Street, Providence, Rhode Island 02912, USA and Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
14
Department of Physics, University of California Davis, One Shields Avenue, Davis, California 95616, USA.
15
Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA.
16
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.
17
South Dakota School of Mines and Technology, 501 East St Joseph Street, Rapid City, South Dakota 57701, USA and South Dakota Science and Technology Authority, Sanford Underground Research Facility, Lead, South Dakota 57754, USA.
18
Department of Physics, University of California Berkeley, Berkeley, California 94720, USA.
19
Department of Physics, University of California Santa Barbara, Santa Barbara, California 93106, USA.
20
Department of Physics, Texas A & M University, College Station, Texas 77843, USA.
21
Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA.
22
South Dakota Science and Technology Authority, Sanford Underground Research Facility, Lead, South Dakota 57754, USA.

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.

PMID:
24655239
DOI:
10.1103/PhysRevLett.112.091303
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