A5101432559- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Neutrino Physics Research
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- advanced mathematical theories
- Advanced NMR Techniques and Applications
- Scientific Research and Discoveries
- Stochastic processes and statistical mechanics
- Scientific Computing and Data Management
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Thermodynamics and Statistical Mechanics
- Radiation Detection and Scintillator Technologies
- International Science and Diplomacy
- Pulsars and Gravitational Waves Research
University of South China
2019-2025
University of Oregon
2018-2025
Fujian University of Technology
2025
Institute of High Energy Physics
2018-2024
University of Groningen
2020-2024
Physico-Technical Institute
2024
Institute of Modern Physics
2024
Fudan University
2024
Inner Mongolia University
2023
Henan University
2023
Dark matter in the sub-GeV mass range is a theoretically motivated but largely unexplored paradigm. Such light masses are out of reach for conventional nuclear recoil direct detection experiments, may be detected through small ionization signals caused by dark matter-electron scattering. Semiconductors well-studied and particularly promising target materials because their $$ \mathcal{O} (1 eV) band gaps allow from particles as few hundred keV. Current technologies being adapted In this...
We study in detail sub-GeV dark matter scattering off electrons xenon, including the expected electron recoil spectra and annual modulation spectra. derive improved constraints using low-energy XENON10 XENON100 ionization-only data. For XENON10, addition to electron-recoil data corresponding about $1-3$ electrons, we include for first time events with $\gtrsim 4$ electrons. Assuming is momentum independent, this strengthens a previous cross-section bound by almost an order of magnitude...
We present the first direct-detection search for sub-GeV dark matter using a new ∼2-gram high-resistivity Skipper CCD from dedicated fabrication batch that was optimized searches. Using 24 days of data acquired in MINOS cavern at Fermi National Accelerator Laboratory, we measure lowest rates silicon detectors events containing one, two, three, or four electrons, and achieve world-leading sensitivity large range masses. Data taken with different thicknesses detector shield suggest correlation...
We have developed ultralow-noise electronics in combination with repetitive, nondestructive readout of a thick, fully depleted charge-coupled device (CCD) to achieve an unprecedented noise level 0.068 e^{-} rms/pixel. This is the first time that discrete subelectron has been achieved reproducible over millions pixels on stable, large-area detector. enables contemporaneous, discrete, and quantized measurement charge pixels, irrespective whether they contain zero electrons or thousands...
We present new direct-detection constraints on eV-to-GeV dark matter interacting with electrons using a prototype detector of the Sub-Electron-Noise Skipper-CCD Experimental Instrument. The results are based data taken in MINOS cavern at Fermi National Accelerator Laboratory. focus obtained two distinct readout strategies. For first strategy, we read out continuously, accumulating an exposure 0.177 gram-days. While observe no events containing three or more electrons, find large one- and...
The Sub-Electron-Noise Skipper CCD Experimental Instrument (SENSEI) uses the recently developed Skipper-CCD technology to search for electron recoils from interaction of sub-GeV dark matter particles with electrons in silicon. We report first results a prototype SENSEI detector, which collected 0.019 g day commissioning data above ground at Fermi National Accelerator Laboratory. These are sufficient set new direct-detection constraints masses between ∼500 keV and 4 MeV. Moreover, since these...
We present the first results from a dark matter search using six Skipper-CCDs in SENSEI detector operating at SNOLAB. employ bias-mitigation technique of hiding approximately 46% our total data and aggressively mask images to remove backgrounds. Given exposure after masking 100.72 gram-days well-performing sensors, we observe 55 two-electron events, 4 three-electron no events containing 4-10 electrons. The are consistent with pileup one-electron events. Among 2 appear pixels that likely...
A bstract Electroweak Baryogenesis (EWBG) is a compelling scenario for explaining the matter-antimatter asymmetry in universe. Its connection to electroweak phase transition makes it inherently testable. However, completely excluding this can seem difficult practice, due sheer number of proposed models. We investigate possibility postulating “no-lose” theorem testing EWBG future e + − or hadron colliders. As first step we focus on factorized picture which separates sources stronger from...
We describe a novel search for MeV-to-GeV-mass dark matter, in which the matter scatters off electrons scintillating target. The excitation and subsequent de-excitation of electron produces one or more photons, could be detected with an array cryogenic low-noise photodetectors, such as transition edge sensors (TES) microwave kinetic inductance devices (MKID). Scintillators may have distinct advantages over other experiments searching low ionization signal from sub-GeV DM. First, detection...
A key strategy for sub-GeV dark matter direct detection is searches small ionization signals that arise from matter-electron scattering or the "Migdal" effect in matter-nucleus scattering. We show theoretical description of both processes closely related, allowing a principal mapping between them. explore this noble-liquid targets and, first time, estimate Migdal semiconductors using crystal form factor. present new constraints XENON10, XENON100, and SENSEI data, give projections proposed...
In this white paper, we discuss the prospects for characterizing and identifying dark matter using gravitational waves, covering a wide range of candidate types signals. We argue that present upcoming wave probes offer unprecedented opportunities unraveling nature identify most urgent challenges open problems with aim encouraging strong community effort at interface between these two exciting fields research.
Direct-detection experiments sensitive to low-energy electron recoils from sub-GeV dark matter interactions will also be solar neutrinos via coherent neutrino-nucleus scattering (CNS), since the recoiling nucleus can produce a small ionization signal. Solar constitute both an interesting signal in their own right and potential background search that cannot controlled or reduced by improved shielding, material purification handling, detector design. We explore these two possibilities detail...
Dark matter (DM) has been searched for at colliders in a largely model-independent fashion by looking an excess number of events involving single jet, or photon, and missing energy. We investigate the possibility excesses more inclusive jet channels. Events with multiple jets contain information thus handles to increase signal-to-background ratio. In particular, we adapt recent CMS ``razor'' analysis from search supersymmetry (SUSY) DM estimate potential reach. The region razor variables...
We consider the absorption by bound electrons of dark matter in form photons and axion-like particles, as well from Sun, current next-generation direct detection experiments. Experiments sensitive to electron recoils can detect such particles with masses between a few eV more than 10 keV. For photon matter, we update previous based on XENON10 data derive new bounds XENON100 CDMSlite. find these experiments disfavor previously allowed parameter space. Moreover, sensitivity projections for...
We use a science-grade skipper charge-coupled device (skipper CCD) operating in low-radiation background environment to develop semiempirical model that characterizes the origin of single-electron events CCDs. identify, separate, and quantify three independent contributions events, which were previously bundled together classified as ``dark counts'': dark current, amplifier light, spurious charge. measure depends on exposure,...
The search for particle-like dark matter with meV-to-GeV masses has developed rapidly in the past few years. We summarize science case these searches, recent progress, and exciting upcoming opportunities. Funding Research Development a portfolio of small projects will allow community to capitalize on substantial advances theory experiment probe vast regions unexplored dark-matter parameter space coming decade.
The forward-backward asymmetry measurement in top-pair production at the Tevatron is about $2\ensuremath{\sigma}$ from standard model prediction. We propose an asymmetric left-right model, which includes a ${W}^{\ensuremath{'}}$ boson with right-handed coupling of down to top quark, and ${Z}^{\ensuremath{'}}$ diagonal couplings up, top, quarks ${M}_{{W}^{\ensuremath{'}}}\ensuremath{\approx}175\text{ }\text{ }\mathrm{GeV}$ ${M}_{{Z}^{\ensuremath{'}}}\ensuremath{\approx}900\text{...
LHC experiments have placed strong bounds on the production of supersymmetric colored particles (squarks and gluinos), under assumption that all flavors squarks are nearly degenerate. However, current experimental constraints stop much weaker, due to smaller cross section difficult backgrounds. While light stops motivated by naturalness arguments, it has been suggested such become impossible detect near limit where their mass is degenerate with sum masses decay products. We show this not...
In the presence of massive bosonic degrees freedom, rotational superradiance can trigger an instability that spins down black holes. This leads to peculiar gravitational-wave signatures and distribution in spin-mass plane, which turn impose stringent constraints on ultralight fields. Here, we demonstrate there is analogous spindown effect for conducting stars. We show rotating stars amplify low frequency electromagnetic waves, this largest when time scale conduction within star order a light...
We study a new class of signals where fermionic dark matter is absorbed by bound electron targets. Fermionic absorption in direct detection and neutrino experiments are sensitive to with sub-MeV mass, probing region parameter space which otherwise challenging detect. calculate the rate energy deposition spectrum xenon-based detectors, making projections for current future experiments. present two possible models that display electrons prospects light other constraints.
The rate of dark matter-electron scattering depends on the underlying velocity distribution matter halo. Importantly, is particularly sensitive to high-velocity tail, which differs significantly amongst various halo models. In this work, we summarize leading models and discuss parameters enter them. We recommend updated values for these based recent studies measurements. Furthermore, quantify dependence choice model parameters, demonstrate how choices propagate predicted cross-section...
A bstract Ultralight dark matter is a compelling candidate. In this work, we examine the impact of quadratically-coupled ultralight on predictions Big Bang Nucleosynthesis. The presence can modify effective values fundamental constants during Nucleosynthesis, modifying predicted abundances primordial elements such as Helium-4. We improve upon existing literature in two ways: firstly, take into account thermal mass acquired by due to its quadratic interactions with Standard Model bath, which...
A bstract Oscura is a planned light-dark matter search experiment using Skipper-CCDs with total active mass of 10 kg. As part the detector development, collaboration plans to build Integration Test (OIT), an engineering test 10% mass. Here we discuss early science opportunities OIT for millicharged particles (mCPs) NuMI beam at Fermilab. mCPs would be produced low energies through photon-mediated processes from decays scalar, pseudoscalar, and vector mesons, or direct Drell-Yan productions....