A5008998774- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Neutrino Physics Research
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Quantum and Classical Electrodynamics
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
University of Maryland, College Park
2016-2025
Institute of High Energy Physics
2013-2024
Nanjing University
2024
University of Chinese Academy of Sciences
2023
Campbell Collaboration
2023
Shanghai Jiao Tong University
2013-2022
Southeastern Universities Research Association
2021-2022
Nankai University
2019-2022
Yalong Hydro (China)
2022
Tibet University
2020
I introduce a gauge invariant decomposition of the nucleon spin into quark helicity, orbital, and gluon contributions. The total (and hence orbital) contribution is shown to be measurable through virtual Compton scattering in special kinematic region where single dominates. This deeply-virtual (DVCS) has much potential unravel structure nucleon.
We study in QCD the physics of deeply-virtual Compton scattering (DVCS)---the virtual process large s and small t kinematic region. show that DVCS can probe a new type off-forward parton distributions. derive an Altarelli-Parisi evolution equations for these also their sum rules terms nucleon form-factors twist-two quark gluon operators. In particular, we find second rule is related to fractions spin carried separately by quarks gluons. estimate cross section compare it with accompanying...
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...
I show that the parton physics related to correlations of quarks and gluons on light cone can be studied through matrix elements frame-dependent, equal-time correlators in large momentum limit. This observation allows practical calculations properties a Euclidean lattice. As an example, demonstrate how recover leading-twist quark distribution by boosting correlator momentum.
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...
We argue a factorization formula for semi-inclusive deep-inelastic scattering with hadrons in the current fragmentation region detected at low transverse momentum. To facilitate factorization, we introduce transverse-momentum dependent parton distributions and functions gauge links slightly off light cone, soft-gluon radiations subtracted. verify to one-loop order perturbative quantum chromodynamics that it is valid all orders perturbation theory.
Recently, there have been some interesting developments involving off-forward parton distributions of the nucleon, deeply virtual Compton scattering, and hard diffractive vector-meson production. These are triggered by realization that contain information about internal spin structure nucleon electroproduction vector mesons depends on these unconventional distributions. This paper gives a brief overview recent developments.
We study the chiral-odd spin structure functions of nucleon, ${\mathit{h}}_{1}$(x) and ${\mathit{h}}_{2}$(x), their physical significance, sum rules, model estimates. show that they can be measured in Drell-Yan process with polarized beams at order ${\mathit{Q}}^{0}$ ${\mathit{Q}}^{\mathrm{\ensuremath{-}}1}$, respectively.
We present the first direct lattice calculation of isovector sea-quark distributions in nucleon within framework large-momentum effective field theory proposed recently. use ${N}_{f}=2+1+1$ highly improved staggered quarks gauge ensembles (generated by MILC Collaboration) and clover valence fermions with pion mass 310 MeV. establish convergence result as momentum increases uncertainty calculation. Although systematics are not yet fully under control, we obtain some qualitative features...
Since the parton model was introduced by Feynman more than fifty years ago, we have learned much about partonic structure of proton through a large body high-energy experimental data and dedicated global fits. However, calculating observables such as distribution function (PDFs) from fundamental theory strong interactions, QCD, has made limited progress. Recently, authors advocated formalism, large-momentum effective (LaMET), which one can extract physics properties travelling at moderate...
We present the first lattice-QCD calculation of isovector polarized parton distribution functions (both helicity and transversity) using large-momentum effective field theory (LaMET) approach for direct Bjorken-$x$ dependence. review detailed steps procedure in unpolarized case, then generalize to transversity cases. also derive a new mass-correction formulation all three compare effects each finite-momentum correction lattice data calculated at $M_\pi\approx 310$ MeV. Finally, we discuss...
In a large-momentum nucleon state, the matrix element of gauge-invariant Euclidean Wilson line operator accessible from lattice QCD can be related to standard light-cone parton distribution function through effective theory (LaMET) expansion. This relation is given by factorization formula with nontrivial matching coefficient. Using product expansion we derive quasiparton in LaMET, and show that more recently discussed pseudoparton approach also obeys an equivalent formula. Explicit results...
This paper presents a comprehensive review of both the theory and experimental successes Quantum Chromodynamics, starting with its emergence as well defined in 1972-73 following developments results up to present day. Topics include earliest theoretical foundations; fundamental constants QCD; an introductory discussion lattice QCD, only known method for obtaining exact predictions from methods approximating special focus on effective field theories; QCD under extreme conditions; measurements...
The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure solar <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> neutrino flux by detecting neutrinos through coherent scattering with nuclei. Data samples requiring coincidence of scintillation and ionization...
We develop an approach for calculating heavy quark effective theory (HQET) light-cone distribution amplitudes (LCDAs) by employing a sequential methodology. The theoretical foundation of the framework is established, elucidating how quasidistribution (quasi-DAs) with three scales can be utilized to compute HQET LCDAs. provide support this demonstrating rationale behind devising hierarchical ordering involved scales, discussing factorization at each step, clarifying underlying reason...
Based on a recent work the quantum chromodynamic (QCD) factorization for semi-inclusive deep-inelastic scattering (DIS), we present set of formulas spin-dependent DIS and Drell-Yan cross sections at low transverse momentum.
We develop the concept of quantum phase-space (Wigner) distributions for quarks and gluons in proton. To appreciate their physical content, we analyze contraints from special relativity on interpretation elastic form factors, examine physics Feynman parton proton's rest frame. relate quark Wigner functions to transverse-momentum dependent generalized distributions, emphasizing role skewness parameter. show that allow visualize using language classical phase space. present two examples point...
From the deep-inelastic momentum sum rule and trace anomaly of QCD energy-momentum tensor, I derive a separation nucleon mass into contributions quark gluon kinetic potential energies, masses, anomaly. The is done in rest frame at [modified minimal subtraction scheme ($\stackrel{-}{\mathrm{MS}}$)] renormalization scale 1 Ge${\mathrm{V}}^{2}$.