A5046841180- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Functional Brain Connectivity Studies
- Pneumonia and Respiratory Infections
- Nuclear and radioactivity studies
- Radiation Therapy and Dosimetry
University of Liverpool
2018-2025
University of California, Davis
2021-2024
Rutherford Appleton Laboratory
2021
Lawrence Berkeley National Laboratory
2020
University of California, Berkeley
2020
Imperial College London
2019
Moscow Engineering Physics Institute
2017
The LUX-ZEPLIN experiment is a dark matter detector centered on dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN's first search for weakly interacting massive particles (WIMPs) with an exposure of 60~live days using fiducial mass 5.5 t. A profile-likelihood ratio analysis shows data to be consistent background-only hypothesis, setting new limits spin-independent...
LUX-ZEPLIN (LZ) is a next-generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using two-phase xenon detector with an active mass of 7 tonnes, LZ search primarily for low-energy interactions weakly interacting massive particles (WIMPs), which are hypothesized to make up our galactic halo. In this paper, projected WIMP sensitivity presented based on latest background estimates...
The nature of dark matter and properties neutrinos are among the most pressing issues in contemporary particle physics. dual-phase xenon time-projection chamber is leading technology to cover available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity many alternative candidates. These detectors can also study through neutrinoless double-beta decay a variety astrophysical sources. A next-generation xenon-based detector will therefore be...
The scattering of dark matter (DM) particles with sub-GeV masses off nuclei is difficult to detect using liquid xenon-based DM search instruments because the energy transfer during nuclear recoils smaller than typical detector threshold. However, tree-level DM-nucleus diagram can be accompanied by simultaneous emission a bremsstrahlung photon or so-called "Migdal" electron. These provide an electron recoil component experimental signature at higher energies corresponding recoil. presence...
The LUX-ZEPLIN (LZ) experiment is a dark matter detector centered on dual-phase xenon time projection chamber. We report searches for new physics appearing through few-keV-scale electron recoils, using the experiment's first exposure of 60 live days and fiducial mass 5.5 t. data are found to be consistent with background-only hypothesis, limits set models including solar axion coupling, neutrino magnetic moment millicharge, couplings galactic axionlike particles hidden photons. Similar...
Following the first science results of LUX-ZEPLIN (LZ) experiment, a dual-phase xenon time projection chamber operating from Sanford Underground Research Facility in Lead, South Dakota, USA, we report initial limits on model-independent nonrelativistic effective field theory describing complete set possible interactions weakly interacting massive particle (WIMP) with nucleon. These utilize same 5.5 t fiducial mass and 60 live days exposure collected for LZ spin-independent spin-dependent...
Abstract LUX-ZEPLIN (LZ) is a second-generation direct dark matter experiment with spin-independent WIMP-nucleon scattering sensitivity above $${1.4 \times 10^{-48}}\, {\hbox {cm}}^{2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>1.4</mml:mn> <mml:mo>×</mml:mo> <mml:msup> <mml:mn>10</mml:mn> <mml:mo>-</mml:mo> <mml:mn>48</mml:mn> </mml:mrow> </mml:msup> <mml:mspace/> <mml:mtext>cm</mml:mtext> <mml:mn>2</mml:mn> </mml:math> for WIMP mass of $${40}\, \hbox...
Dual-phase xenon detectors, as currently used in direct detection dark matter experiments, have observed elevated rates of background electron events the low energy region. While this negatively impacts detector performance various ways, its origins only been partially studied. In paper we report a systematic investigation pathologies LUX experiment. We characterize different populations based on their emission intensities and correlations with preceding depositions detector. By studying...
The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to $6.5\times10^{-48}$ cm$^2$ for the spin-independent interaction of a 30 GeV/c$^2$ WIMP at 90% confidence level. In this paper, we present comprehensive analysis backgrounds important result and other upcoming physics analyses, including neutrinoless double-beta decay searches effective field theory interpretations data. We confirm that in-situ determinations bulk fixed...
Searches for dark matter with liquid xenon time projection chamber experiments have traditionally focused on the region of parameter space that is characteristic weakly interacting massive particles, ranging from a few GeV/$c^2$ to TeV/$c^2$. Models mass much heavier than this are well motivated by early production mechanisms different standard thermal freeze-out, but they generally been less explored experimentally. In work, we present re-analysis first science run (SR1) LZ experiment, an...
Various dark matter models predict annual and diurnal modulations of interaction rates in Earth-based experiments as a result the Earth's motion halo. Observation such features can provide generic evidence for detection interactions. This paper reports search both rate LUX experiment using over 20 calendar months data acquired between 2013 2016. focuses on electron recoil events at low energies, where leptophilic interactions are expected to occur DAMA has observed strong modulation two...
We present a comprehensive analysis of electronic recoil vs nuclear discrimination in liquid/gas xenon time projection chambers, using calibration data from the 2013 and 2014--2016 runs Large Underground Xenon experiment. observe strong charge-to-light enhancement with increased event energy. For events $\mathrm{S}1=120$ detected photons, i.e., equivalent to energy $\ensuremath{\sim}100\text{ }\mathrm{keV}$, we an background acceptance $<{10}^{\ensuremath{-}5}$ at signal 50%. also modest...
Dual-phase xenon time projection chamber (TPC) detectors offer heightened sensitivities for dark matter detection across a spectrum of particle masses. To broaden their capability to low-mass interactions, we investigated the light and charge responses liquid (LXe) sub-keV nuclear recoils. Using neutron events from pulsed Adelphi Deuterium-Deuterium generator, an in situ calibration was conducted on LUX detector. We demonstrate direct measurements yields down 0.45 0.27 keV, respectively,...
The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double $\ensuremath{\beta}$ decay search in parallel to the main science goal of discovering dark matter particle interactions. We report expected LZ sensitivity $^{136}\mathrm{Xe}$ decay, taking advantage significant ($>600$ kg) mass contained within active volume without isotopic enrichment. After 1000 live-days, median exclusion half-life is projected be $1.06\ifmmode\times\else\texttimes\fi{}{10}^{26}$ years (90% confidence...
We present a novel analysis technique for liquid xenon time projection chambers that allows lower threshold by relying on events with prompt scintillation signal consisting of single detected photons. The energy the LUX dark matter experiment is primarily determined smallest response detectable, which previously required twofold coincidence in its photomultiplier arrays, enforced data analysis. presented here exploits double photoelectron emission effect observed some models at vacuum...
LUX-ZEPLIN is a dark matter detector expected to obtain world-leading sensitivity weakly-interacting massive particles interacting via nuclear recoils with $\ensuremath{\sim}7$-tonne xenon target mass. This paper presents projections several low-energy signals of the complementary electron recoil signal type: 1) an effective neutrino magnetic moment, and 2) millicharge, both for $pp$-chain solar neutrinos, 3) axion flux generated by Sun, 4) axionlike forming Galactic matter, 5) hidden...
This paper presents a novel technique for mitigating electrode backgrounds that limit the sensitivity of searches low-mass dark matter (DM) using xenon time projection chambers. In Large Underground Xenon (LUX) detector, signatures DM interactions would be very low-energy ($\ensuremath{\sim}\mathrm{keV}$) scatters in active target ionize only few atoms and seldom produce detectable scintillation signals. this regime, extra precaution is required to reject complex set electron have long been...
We estimate the amount of $^{37}\mathrm{Ar}$ produced in natural xenon via cosmic-ray-induced spallation, an inevitable consequence transportation and storage on Earth's surface. then calculate resulting concentration a 10-tonne payload (similar to that LUX-ZEPLIN experiment) assuming representative schedule purification, storage, delivery underground facility. Using spallation model by Silberberg Tsao, sea-level production rate is estimated be $0.024\text{ }\text{...
Dark matter (DM) direct detection experiments aim to place constraints on the DM-nucleon scattering cross-section and DM particle mass. These depend sensitively assumed local density velocity distribution function. While astrophysical observations can inform former (in a model-dependent way), latter is not directly accessible with observations. Here we use high-resolution ARTEMIS cosmological hydrodynamical simulation suite of 42 Milky Way-mass halos explore spatial kinematical distributions...
We report here the results of an Effective Field Theory (EFT) WIMP search analysis using LUX data. build upon previous analyses by extending window to include nuclear recoil energies up $\sim$180 keV$_{nr}$, requiring a reassessment data quality cuts and background models. In order use binned Profile Likelihood statistical framework, development new techniques account for higher-energy backgrounds was required. With 3.14$\times10^4$ kg$\cdot$day exposure collected between 2014 2016, we set...
We report results from an extensive set of measurements the \b{eta}-decay response in liquid xenon.These are derived high-statistics calibration data injected sources both $^{3}$H and $^{14}$C LUX detector. The mean light-to-charge ratio is reported for 13 electric field values ranging 43 to 491 V/cm, energies 1.5 145 keV.