Probing sub-GeV dark matter with liquid xenon TPCs is possible using the ionization-only signal. However, sensitivity with these detectors is currently hindered due to instrument backgrounds, delayed electron and photon emission. In this presentation, we show new data revealing the source of delayed emission. We discuss possible ways to mitigate this background for future experiments, and...
We present the crystalline xenon time projection chamber (TPC), a promising novel technology for next-generation dark matter searches. Initial tests have established that it maintains many of the benefits of the liquid xenon TPC while also effectively excluding radon, the dominant background in currently-running xenon dark matter experiments such as LZ. This offers the potential for greatly...
The LZ (LUX-ZEPLIN) collaboration operates a 7-tonne active mass, two-phase xenon TPC (Time Projection Chamber) surrounded by a multi-layer OD (Outer Detector) serving as an anti-coincidence veto, in order to find the elusive dark matter, at SURF (Sanford Underground Research Facility), the former location of the Homestake gold mine in the town of Lead, South Dakota. In service of the search...
nEXO is a 5 tonne liquid xenon (LXe) time projection chamber (TPC) that aims to detect neutrinoless double beta decay in $^{136}$Xe with a projected $90 \%$ CL half-life sensitivity of $1.35 \mathrm{x}10^{28}$ yr. nEXO will be able to measure energy deposits from both ionization electrons and scintillation photons from events that occur inside the detector. To achieve the required 10 ms...
Low-threshold, low-background noble liquid ionization detectors are desired for low-mass dark matter and Coherent Elastic Neutrino Nucleus Scattering (CEνNS) searches. Of the two primary noble elements used for particle detection, argon and xenon, argon can yield higher energy nuclear recoils, but the electroluminescence light produced by Ar2 dimer is difficult to collect and the slow...
Neutrinoless double beta decay (0vbb) is a lepton-number-violating process that is forbidden in the Standard Model. The observation of 0vbb would imply that neutrinos are their own anti-particles, and provide an important step towards explaining the asymmetry of matter and anti-matter in the universe. nEXO is a proposed next-generation 0vbb experiment containing 5000 kg of isotopically...
Liquid argon detectors are widely used in neutrino physics and dark matter detection through the collection of ionization charge and/or scintillation light produced by particles interacting in the bulk liquid argon. The introduction of hydrocarbon-based photo-ionizing dopant into a liquid argon detector can extend its detection capabilities by lowering the energy threshold for charge...
Liquid Argon Time Projection Chamber (LArTPC) is an exceptional dual calorimeter capable of estimating the energy of incident particles through both the ionization charge and the scintillation light. This talk will show that due to the mechanisms of charge recombination and light generation involved in the energy dissipation in liquid argon, light calorimetry in LArTPCs is inherently...
Adding light dopant gasses like hydrogen to liquid xenon detectors is expected to improve their sensitivity to low-energy recoils—and consequently sub-GeV dark matter. HydroX is a multi-institution effort to explore the feasibility of this method for use in current and future liquid-xenon dark matter experiments, such as LZ. As part of this initiative, we have constructed a test stand at SLAC...
The Liquid Xenon Time-Projection Chamber (LXe TPC) is a prominent technology for direct dark matter and neutrinoless double-beta decay searches. The next generation of LXe TPCs aims to increase their drift lengths while maintaining high operational electric fields in the hundreds of volts per centimeter. To achieve this goal, we need to gain a clearer understanding of how various engineered...
The DUNE far detector consists of liquid argon time-projection chambers (LArTPCs), which allow for kiloton-scale fiducial mass necessary for rare event searches and sub-centimeter spatial resolution required to image those events with high precision. In the vertical drift LArTPC detector, a horizontal cathode bisects the fiducial volume, creating two stacked drift volumes in which ionization...
Recent publications on solar neutrino detection in large dual-phase Xe detectors cite the absence of condensed matter physics models and use Bayesian analysis, like toy Monte-Carlo simulations and data-driven correction to account for delayed electron and photon emission and other detector physics effects. We tried to fill the gap and consider possible microscopic mechanisms of observed...
The proposed Forward Physics Facility (FPF) is an underground cavern at zero degrees to IP1 with the space and infrastructure to support a suite of far-forward experiments at the Large Hadron Collider in the High Luminosity era (HL-LHC). The Forward Liquid Argon Experiment (FLArE) is a Liquid Argon Time Projection Chamber (LArTPC) based detector designed for very high-energy neutrinos and...
