Query: Dark detector

title: Construction of Sensor Based Dark Detector for Lighting Purpose on a Stair case
abstract: Reports on stair case related injuries shows an increasing rate yearly. Investigations have been carried out as to the causes of these staircase hazards and also explored befitting means of preventing the hazards through the use of handrails, staircase safety signs, proper lighting systems, etc. Common staircase lighting consists of a dependent element on staircase and is regarded as an environmental control tool for both direct and indirect elimination of staircase hazards. Due to the importance of staircase lighting systems, most staircase lights are left on even when not needed. Sometimes, due to inefficient operations, they are left on for very long periods leading to waste of electricity and increased electricity bills. This paper therefore reports the construction of a sensor based dark detector to automatically switch ON or switch OFF staircase lighting systems in dark or bright conditions respectively such that the safe use of a staircase is ensured when it is dark, and electricity is conserved when it is bright. The construction was achieved through the use of a Light Dependent Resistor (LDR) as the dark sensing component, a Transistor (BC547) as an amplifier and a Single Pole Double Throw (SPDT) relay as the switch, to switch on or switch off the staircase lighting system. The construction was tested and functioned well.

title: Constraints on low mass, relic dark matter candidates from a surface operated SuperCDMS single charge sensitive detector
abstract: This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, and on dark photon and axion like particle absorption, using a second generation SuperCDMS high voltage eV resolution detector. The 0.93 gram Si detector achieved a 3 eV phonon energy resolution; for a detector bias of 100 V, this corresponds to a charge resolution of 3% of a single electron hole pair. The energy spectrum is reported from a blind analysis with 1.2 gram days of exposure acquired in an above ground laboratory. With charge carrier trapping and impact ionization effects incorporated into the dark matter signal models, the dark matter electron cross section \bar{\sigma}_{e} is constrained for dark matter masses from 0.5 $10^{4} $MeV$/c^{2} in the mass range from 1.2 50 eV$/c^{2} the dark photon kinetic mixing parameter \varepsilon$ and the axioelectric coupling constant $g_{ae} are constrained. The minimum 90% confidence level upper limits within the above mentioned mass ranges are \bar{\sigma}_{e},8.7\times10^ 34} cm${2} \varepsilon\,3.3\times10^ 14} and $g_{ae},1.0\times10^ 9}

title: Design and construction of the DEAP 3600 dark matter detector
abstract: The Dark matter Experiment using Argon Pulse shape discrimination (DEAP) has been designed for a direct detection search for particle dark matter using a single phase liquid argon target. The projected cross section sensitivity for DEAP 3600 to the spin independent scattering of Weakly Interacting Massive Particles (WIMPs) on nucleons is 10 46cm2 for a 100 GeV/c2 WIMP mass with a fiducial exposure of 3 tonne years. This paper describes the physical properties and construction of the DEAP 3600 detector.

title: Search for dark matter and other new phenomena in events with an energetic jet and large missing transverse momentum using the ATLAS detector
abstract: A bstractResults of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses proton proton collision data corresponding to an integrated luminosity of 36.1 fb 1 at a centre of mass energy of 13 TeV collected in 2015 and 2016 with the ATLAS detector at the Large Hadron Collider. Events are required to have at least one jet with a transverse momentum above 250 GeV and no leptons (e or m) Several signal regions are considered with increasing requirements on the missing transverse momentum above 250 GeV. Good agreement is observed between the number of events in data and Standard Model predictions. The results are translated into exclusion limits in models with pair produced weakly interacting dark matter candidates, large extra spatial dimensions, and supersymmetric particles in several compressed scenarios.

title: First Dark Matter Constraints from a SuperCDMS Single Charge Sensitive Detector.
abstract: We present the first limits on inelastic electron scattering dark matter and dark photon absorption using a prototype SuperCDMS detector having a charge resolution of 0.1 electron hole pairs (CDMS HVeV, a 0.93 g CDMS high voltage device) These electron recoil limits significantly improve experimental constraints on dark matter particles with masses as low as 1 MeV/c^{2} We demonstrate a sensitivity to dark photons competitive with other leading approaches but using substantially less exposure (0.49 g d) These results demonstrate the scientific potential of phonon mediated semiconductor detectors that are sensitive to single electronic excitations.

title: Prepared for submission to JCAP DARWIN towards the ultimate dark matter detector DARWIN collaboration
abstract: DARk matter WImp search with liquid xenoN (DARWIN1) will be an experiment for the direct detection of dark matter using a multi ton liquid xenon time projection chamber at its core. Its primary goal will be to explore the experimentally accessible parameter space for Weakly Interacting Massive Particles (WIMPs) in a wide mass range, until neutrino interactions with the target become an irreducible background. The prompt scintillation light and the charge signals induced by particle interactions in the xenon will be observed by VUV sensitive, ultra low background photosensors. Besides its excellent sensitivity to WIMPs above a mass of 5GeV/c2, such a detector with its large mass, low energy threshold and ultra low background level will also be sensitive to other rare interactions. It will search for solar axions, galactic axion like particles and the neutrinoless double beta decay of 136Xe, as well as measure the low energy solar neutrino flux with <1% precision, observe coherent neutrino nucleus interactions, and detect galactic supernovae. We present the concept of the DARWIN detector and discuss its physics reach, the main sources of backgrounds and the ongoing detector design and R&D efforts.

title: Results on light dark matter particles with a low threshold CRESST II detector
abstract: The CRESST II experiment uses cryogenic detectors to search for nuclear recoil events induced by the elastic scattering of dark matter particles in CaWO$$_4$$4 crystals. Given the low energy threshold of our detectors in combination with light target nuclei, low mass dark matter particles can be probed with high sensitivity. In this letter we present the results from data of a single detector module corresponding to 52 kg live days. A blind analysis is carried out. With an energy threshold for nuclear recoils of 307 eV we substantially enhance the sensitivity for light dark matter. Thereby, we extend the reach of direct dark matter experiments to the sub GeV/$c^2$$c2 region and demonstrate that the energy threshold is the key parameter in the search for low mass dark matter particles.

title: Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at s=13 TeV with the ATLAS detector
abstract: A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton proton collisions at s=13 TeV is presented.

title: The deepest dark detector
abstract: In the heart of a mountain in China's Sichuan province, underneath 2400 meters of stone, researchers are powering up the most ambitious effort yet to directly detect some of the strangest stuff in the universe: dark matter. Early this year, the PandaX (Particle and Astrophysical Xenon) experiment will start collecting data in hopes of finding evidence of the elusive particles, thought to constitute more than 80 percent of the matter in the universe.

title: Search for dark matter produced in association with bottom or top quarks in \sqrt{s}=13$$s=13 TeV pp collisions with the ATLAS detector
abstract: A search for weakly interacting massive dark matter particles produced in association with bottom or top quarks is presented. Final states containing third generation quarks and missing transverse momentum are considered. The analysis uses $36.1 \mathrm {fb} 1}$36.1fb 1 of proton proton collision data recorded by the ATLAS experiment at \sqrt{s}=13$$s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin 0 dark matter mediators. For colour neutral spin 0 mediators produced in association with top quarks and decaying into a pair of dark matter particles, mediator masses below 50 GeV are excluded assuming a dark matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross section of 300 times the predicted rate for mediators with masses between 10 and $50\ \hbox {GeV}$50GeV and assuming a dark matter mass of $1 \hbox {GeV}$1GeV and unitary coupling. Constraints on colour charged scalar simplified models are also presented. Assuming a dark matter particle mass of $35\ \hbox {GeV}$35GeV, mediator particles with mass below $1.1\ \hbox {TeV}$1.1TeV are excluded for couplings yielding a dark matter relic density consistent with measurements.