A Global Analysis of Light and Charge Yields in Liquid Xenon

Lenardo, B. G.; Kazkaz, K.; Manalaysay, A.; Möck, J.; Szydagis, M.; Tripathi, M.

doi:10.1109/tns.2015.2481322

Cited by 104 publications

(152 citation statements)

References 49 publications

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“…In the bottom panel of Fig. 1, the medians and widths of the NR data were compared to those obtained from the NEST-1.0 NR model [13] with detector parameters (PDE, EEE, SEG, and DPF) taken into account, and a good agree-3 ment is observed. The distributions in S1 and S2 were also compared to the MC, a small discrepancy was observed in detailed shape for small S1 and S2.…”

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confidence: 79%

“…The AmBe calibration was carried out inbetween the dark matter running periods. A full Monte Carlo (MC) simulation based on Geant4 [10, 11] (v10.2) including neutron-gamma correlated emission from the source, detailed detector geometry, neutron propagation in and interactions with the detector (following the recommended physics list [12]), and S1-S2 signal production (NEST-1.0-based [13]) was developed to compare to the data. According to the simulation, less than 10% of the low energy events are contaminated with multiple scattering in the dead region ("neutron-X").…”

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confidence: 99%

See 1 more Smart Citation

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Tan¹,

Xiao²,

Cui³

et al. 2016

Phys. Rev. Lett.

604

697

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We report the WIMP dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing underground Laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3×10 4 kg-day, the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 5 and 1000 GeV/c 2 . The best upper limit on the scattering cross section is found 2.5 × 10 −46 cm 2 for the WIMP mass 40 GeV/c 2 at 90% confidence level.Weakly interacting massive particles, WIMPs in short, are a class of hypothetical particles that came into existence shortly after the Big Bang. The WIMPs could naturally explain the astronomical and cosmological evidences of dark matter in the Universe. The weak interactions between WIMPs and ordinary matter could lead to the recoils of atomic nuclei that produce detectable signals in deep-underground direct detection experiments. Over the past decade, the dual-phase xenon time-projection chambers (TPC) emerged as a powerful technology for WIMP searches both in scaling up the target mass, as well as in improving background rejection [1][2][3]. LUX, a dark matter search experiment with a 250 kg liquid xenon target, has recently reported the best limit of 6×10 −46 cm 2 on the WIMP-nucleon scattering cross section [4] The PandaX-II experiment, a half-ton scale dual-phase xenon experiment at the China JinPing underground Laboratory (CJPL), has recently reported the dark matter search results from its commissioning run (Run 8,19.1 live days) with a 5845 kg-day exposure [5]. The data were contaminated with significant 85 Kr background. After a krypton distillation campaign in early 2016, PandaX-II commenced physics data taking in March 2016. In this paper, we report the combined WIMP search results using the data from the first physics run from March 9 to June 30, 2016 (Run 9, 79.6 live days) and Run 8, with a total of 3.3×10 4 kg-day exposure, the largest reported WIMP data set among dual-phase xenon detectors in the world to date.The PandaX-II detector has been described in detail in Ref. [5]. The liquid xenon target consists of a cylindrical TPC with dodecagonal cross section (opposite-side distance 646 mm), confined by the polytetrafluoroethylene (PTFE) reflective wall, and a vertical drift distance of 600 mm defined by the cathode mesh and gate grid located at the bottom and top. For each physical event, the prompt scintillation photons (S1) and the delayed electroluminescence photons (S2) from the ionized electrons are collected by two arrays of 55 Hamamatsu R11410-arXiv:1607.07400v3 [hep-ex] Hamamatsu R8520-406 1-inch PMTs serving as an active veto. The γ background, which produces electron recoil (ER) events, can be distinguished from the dark matter nuclear recoil (NR) using the S2-to-S1 ratio. During the data taking period in Run 9, a few diffe...

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confidence: 79%

mentioning

confidence: 99%

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Tan¹,

Xiao²,

Cui³

et al. 2016

Phys. Rev. Lett.

604

697

View full text Add to dashboard Cite

show abstract

“…(ii) The production of both Vacuum Ultra-Violet (VUV) scintillation photons and thermal ionization electrons. This is modeled with the Noble Element Simulation Technique (NEST) [38,39] formalism, a frequently updated semiempirical collection of models based on past detectors' calibration data. The number of such photons and electrons that are generated is in general anticorrelated and depends on the interacting particle type, the magnitude of the electric drift field, and the energies of the recoils.…”

Section: Simulations: Luxsim a Infrastructurementioning

confidence: 99%

Calibration, event reconstruction, data analysis, and limit calculation for the LUX dark matter experiment

Akerib¹,

Alsum²,

Araújo³

et al. 2018

Phys. Rev. D

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The LUX experiment has performed searches for dark-matter particles scattering elastically on xenon nuclei, leading to stringent upper limits on the nuclear scattering cross sections for dark matter. Here, for results derived from 1.4 × 10 4 kg days of target exposure in 2013, details of the calibration, event-reconstruction, modeling, and statistical tests that underlie the results are presented. Detector performance is characterized, including measured efficiencies, stability of response, position resolution, and discrimination between electron-and nuclear-recoil populations. Models are developed for the drift field, optical properties, background populations, the electron-and nuclear-recoil responses, and the absolute rate of low-energy background events. Innovations in the analysis include in situ measurement of the photomultipliers' response to xenon scintillation photons, verification of fiducial mass with a low-energy internal calibration source, and new empirical models for low-energy signal yield based on large-sample, in situ calibrations.

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“…S1 and S2 are then generated via standard statistical distributions which model stages of detector response (collection of scintillation photons, attenuation of the ionization signal before S2 production, photoelectron and SE distributions). The full model is described in [15] and the fit procedure follows [26]. An alternate parametrization of L (E) by Bezrukov et al [27] is similarly consistent with calibration data and implies higher signal efficiency at low energies; it is shown for reference but does not enter into the reported limit.…”

mentioning

confidence: 92%

Improved Limits on Scattering of Weakly Interacting Massive Particles from Reanalysis of 2013 LUX Data

Akerib¹,

Araújo²,

Bai³

et al. 2016

Phys. Rev. Lett.

411

626

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We present constraints on weakly interacting massive particles (WIMP)-nucleus scattering from the 2013 data of the Large Underground Xenon dark matter experiment, including 1.4 × 10 4 kg day of search exposure. This new analysis incorporates several advances: single-photon calibration at the scintillation wavelength, improved event-reconstruction algorithms, a revised background model including events originating on the detector walls in an enlarged fiducial volume, and new calibrations from decays of an injected tritium β source and from kinematically constrained nuclear recoils down to 1.1 keV. Sensitivity, especially to low-mass WIMPs, is enhanced compared to our previous results which modeled the signal only above a 3 keV minimum energy. Under standard dark matter halo assumptions and in the mass range above 4 GeV c −2 , these new results give the arXiv:1512.03506v3 [astro-ph.CO]

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A Global Analysis of Light and Charge Yields in Liquid Xenon

Cited by 104 publications

References 49 publications

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment

Calibration, event reconstruction, data analysis, and limit calculation for the LUX dark matter experiment

Improved Limits on Scattering of Weakly Interacting Massive Particles from Reanalysis of 2013 LUX Data

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