Pengwei Xie
A5022548788- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Robot Manipulation and Learning
- Neutrino Physics Research
- Particle Detector Development and Performance
- Hand Gesture Recognition Systems
- Human Pose and Action Recognition
- Astrophysics and Cosmic Phenomena
- Advanced Neural Network Applications
- EEG and Brain-Computer Interfaces
- Teaching and Learning Programming
- Computational Physics and Python Applications
- Visual Attention and Saliency Detection
- ECG Monitoring and Analysis
- Thermochemical Biomass Conversion Processes
- Radiation Detection and Scintillator Technologies
- Evolutionary Algorithms and Applications
- Robotics and Sensor-Based Localization
- Reinforcement Learning in Robotics
- Robotics and Automated Systems
- Enhanced Oil Recovery Techniques
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
Tsinghua University
2018-2025
Shanghai Jiao Tong University
2014-2024
Dalian University of Technology
2022-2024
Beijing Academy of Artificial Intelligence
2024
Shanghai Artificial Intelligence Laboratory
2024
Czech Technical University in Prague
2023
University of Geneva
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2023
European Organization for Nuclear Research
2023
Campbell Collaboration
2023
We report a new search of weakly interacting massive particles (WIMPs) using the combined low background data sets in 2016 and 2017 from PandaX-II experiment China. The latest set contains exposure 77.1 live day, with reduced to level 0.8$\times10^{-3}$ evt/kg/day, improved by factor 2.5 comparison previous run 2016. No excess events were found above expected background. With total 5.4$\times10^4$ kg most stringent upper limit on spin-independent WIMP-nucleon cross section was for WIMP mass...
We report the WIMP dark matter search results using first physics-run data of PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at China JinPing Underground Laboratory. No candidate is identified above background. In combination with set during commissioning run, a total exposure 3.3$\times10^4$ kg-day,the most stringent limit to spin-independent interaction between ordinary and for range mass 3.5 1000 GeV/c$^2$. The best upper on scattering cross section found...
New constraints are presented on the spin-dependent weakly-interacting-massive-particle– (WIMP-)nucleon interaction from PandaX-II experiment, using a data set corresponding to total exposure of 3.3×104 kg day. Assuming standard axial-vector WIMP with Xe129 and Xe131 nuclei, most stringent upper limits WIMP-neutron cross sections for WIMPs masses above 10 GeV/c2 in all dark matter direct detection experiments. The minimum limit 4.1×10−41 cm2 at 90% confidence level is obtained mass 40...
We report new searches for solar axions and galactic axionlike dark matter particles, using the first low-background data from PandaX-II experiment at China Jinping Underground Laboratory, corresponding to a total exposure of about 2.7×104 kg day. No axion or particle candidate has been identified. The upper limit on axion-electron coupling (gAe) flux is found be 4.35×10−12 in mass range 10−5 1 keV/c2 with 90% confidence level, similar recent LUX result. also best Fe57 deexcitation. On other...
We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector a total $46.9\text{ }\text{ }\mathrm{tonnes}/\mathrm{day}$ exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from data. 1821 candidates identified within an ionization signal range between 50 and 75 photoelectrons, corresponding to mean electronic recoil 0.08 0.15 keV. The 90% C.L. exclusion limit...
Exploiting both RGB (2D appearance) and Depth (3D geometry) information can improve the performance of semantic segmentation. However, due to inherent difference between information, it remains a challenging problem in how integrate RGB-D features effectively. In this letter, address issue, we propose Non-local Aggregation Network (NANet), with well-designed Multi-modality Module (MNAM), better exploit non-local context at multi-stage. Compared most existing segmentation schemes, which only...
We present PandaX-II constraints on candidate WIMP-nucleon effective interactions involving the nucleon or WIMP spin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and currents, magnetic electric dipole moments, tensor interactions. The data set corresponding a total exposure of 54-ton-days is reanalyzed determine as function mass isospin coupling. obtain cross section bounds $\rm 1.6 \times 10^{-41} cm^2$ 9.0 10^{-42} ($90\%$ c.l.)...
We report the first dark matter search results using commissioning data from PandaX-4T. Using a time projection chamber with 3.7 tonne of liquid xenon target and an exposure 0.63 tonne·year, 1058 candidate events are identified within approximate nuclear recoil energy window between 5 100 keV. No significant excess over background is observed. Our set stringent limit to matter-nucleon spin-independent interactions, lowest excluded cross section (90% C.L.) 3.8×10^{-47} cm^{2} at mass 40 GeV/c^{2}.
We report a novel search for the cosmic-ray boosted dark matter using 100 tonne·day full dataset of PandaX-II detector located at China Jinping Underground Laboratory. With extra energy gained from cosmic rays, sub-GeV particles can produce visible recoil signals in detector. The diurnal modulations rate and spectrum are utilized to further enhance signal sensitivity. Our result excludes matter-nucleon elastic scattering cross section between 10^{-31} 10^{-28} cm^{2} masses 0.1 MeV/c^{2}...
We report the search results of light dark matter through its interactions with shell electrons and nuclei, using commissioning data from PandaX-4T liquid xenon detector. Low energy events are selected to have an ionization-only signal between 60 200 photoelectrons, corresponding a mean nuclear recoil 0.77 2.54 keV electronic 0.07 0.23 keV. With effective exposure 0.55 tonne$\cdot$year, we set most stringent limits within mass range 40 $\rm{MeV/c^2}$ 10 $\rm{GeV/c^2}$ for point-like...
We report a search on sub-MeV fermionic dark matter absorbed by electrons with an outgoing active neutrino using the 0.63 tonne year exposure collected PandaX-4T liquid xenon experiment. No significant signals are observed over expected background. The data interpreted into limits to effective couplings between such and electron. For axial-vector or vector interactions, our sensitivity is competitive in comparison existing astrophysical bounds decay of candidate photon final states. In...
A search for interactions from solar $^{8}\mathrm{B}$ neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this further lowered compared with the previous dark matter, various techniques utilized to suppress background that emerges threshold. blind analysis performed on an effective exposure $0.48\text{ }\text{ }\mathrm{tonne}\text{ }\mathrm{year}$, and no significant excess events observed. Among results obtained...
Xe134 is a candidate isotope for neutrinoless double beta decay (0νββ) search. In addition, the two-neutrino case (2νββ) allowed by standard model of particle physics has not yet been observed. With 656-kg natural xenon in fiducial volume PandaX-4T detector, which contains 10.4% Xe134, and its initial 94.9-day exposure, we have established most stringent constraints on 2νββ 0νββ half-lives, with limits 2.8×1022 yr 3.0×1023 at 90% confidence level, respectively. The limit surpasses previously...
We present the results of a search for weakly interacting massive particles (WIMPs) from commissioning run PandaX-II experiment located at China Jinping Underground Laboratory. A WIMP data set with an exposure $306\ifmmode\times\else\texttimes\fi{}19.1\text{ }\text{ }\mathrm{kg}\text{\ensuremath{-}}\text{day}$ was taken, while its dominant $^{85}\mathrm{Kr}$ background used as electron recoil calibration. No candidates are identified, and 90% upper limit is on spin-independent elastic...
We search for nuclear recoil signals of dark matter models with a light mediator in PandaX-II, direct detection experiment the China Jinping underground laboratory. Using data collected 2016 and 2017 runs, corresponding to total exposure 54 ton day, we set upper limits on zero-momentum matter-nucleon cross section. These have strong dependence mass when it is comparable or below typical momentum transfer. apply our results constrain self-interacting mixing standard model particles, parameter...
We report the results of a weakly interacting massive particle (WIMP) dark matter search using full 80.1 live-day exposure first stage PandaX experiment (PandaX-I) located in China Jin-Ping Underground Laboratory. The PandaX-I detector has been optimized for detecting low-mass WIMPs, achieving photon detection efficiency 9.6%. With fiducial liquid xenon target mass 54.0 kg, no significant excess events were found above expected background. A profile likelihood ratio analysis confirms our...
We report the dark matter search results obtained using full 132 ton$\cdot$day exposure of PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess events is identified above expected background. Upper limits are set on spin-independent matter-nucleon interactions. The lowest 90% confidence level exclusion cross section $2.2\times 10^{-46}$ cm$^2$ at a WIMP mass 30 GeV/$c^2$.
A bstract PandaX-4T is a ton-scale dark matter direct detection experiment using dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, ICP-MS, NAA, radon emanation measurement system, krypton assay station, alpha system. Low materials were selected assemble detector. Surface treatment procedures investigated further suppress...
Compared with the signature of dark matter elastic scattering off nuclei, absorption fermionic by nuclei opens up a new searching channel for light characteristic monoenergetic signal. In this Letter, we explore 95.0-day data from PandaX-4T commissioning run and report first dedicated results signal through neutral current process. No significant was found, lowest limit on matter-nucleon interaction cross section is set to be 1.5×10^{-50} cm^{2} mass 40 MeV/c^{2} 90% confidence level.
Generalizable manipulation skills, which can be composed to tackle long-horizon and complex daily chores, are one of the cornerstones Embodied AI. However, existing benchmarks, mostly a suite simulatable environments, insufficient push cutting-edge research works because they lack object-level topological geometric variations, not based on fully dynamic simulation, or short native support for multiple types tasks. To this end, we present ManiSkill2, next generation SAPIEN ManiSkill...
We report results of a search for dark-matter–nucleon interactions via dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With ionization-signal-only and utilizing Migdal effect, we set most stringent limits on cross section matter masses ranging 30 MeV/c2 to 2 GeV/c2. Under assumption that is photon decays into scalar pairs in early Universe, rule out significant parameter space such thermal relic dark-matter model.Received 4 August 2023Revised 23...