A5008862777- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
- Computational Physics and Python Applications
- Quantum, superfluid, helium dynamics
- Quantum Mechanics and Applications
- Particle Detector Development and Performance
- Physics of Superconductivity and Magnetism
- Cosmology and Gravitation Theories
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- High-pressure geophysics and materials
- Theoretical and Computational Physics
- Particle Accelerators and Free-Electron Lasers
- Advanced NMR Techniques and Applications
- Neutrino Physics Research
- Biochemical Analysis and Sensing Techniques
- International Science and Diplomacy
- Olfactory and Sensory Function Studies
- Laser-Plasma Interactions and Diagnostics
Nanjing University
2018-2025
Thomas Jefferson National Accelerator Facility
2019-2023
SLAC National Accelerator Laboratory
2023
Stanford University
2023
Charles University
2023
Czech Academy of Sciences, Institute of Organic Chemistry and Biochemistry
2023
Louisiana State University
2022
Argonne National Laboratory
2011-2020
Georgia Institute of Technology
2019
Duke University
2008-2018
Dyson-Schwinger equations furnish a Poincare' covariant framework within which to study hadrons. A particular feature is the existence of nonperturbative, symmetry preserving truncation that enables proof exact results. The gap equation reveals dynamical chiral breaking tied long-range behaviour strong interaction, thereby constrained by observables, and pion precisely understood, seen exist simultaneously as Goldstone mode bound state strongly dressed quarks. systematic error associated...
Independent of assumptions about the form quark-quark scattering kernel $K$, we derive explicit relation between flavor-nonsinglet pseudoscalar-meson Bethe-Salpeter amplitude ${\ensuremath{\Gamma}}_{H}$ and dressed-quark propagator in chiral limit. In addition to a term proportional ${\ensuremath{\gamma}}_{5}$, necessarily contains qualitatively quantitatively important terms ${\ensuremath{\gamma}}_{5}\ensuremath{\gamma}\ensuremath{\cdot}P$...
Abstract Lepton scattering is an established ideal tool for studying inner structure of small particles such as nucleons well nuclei. As a future high energy nuclear physics project, Electron-ion collider in China (EicC) has been proposed. It will be constructed based on upgraded heavy-ion accelerator, High Intensity Accelerator Facility (HIAF) which currently under construction, together with new electron ring. The proposed provide highly polarized electrons (with polarization ∼80%) and...
We survey contemporary studies of hadrons and strongly interacting quarks using QCD's Dyson—Schwinger equations, addressing the following aspects: confinement dynamical chiral symmetry breaking; hadron spectrum; elastic transition form factors, from small- to large-Q2; parton distribution functions; physics containing one or more heavy quarks; properties quark gluon plasma.
We project onto the light front pion's Poincaré-covariant Bethe-Salpeter wave function obtained using two different approximations to kernels of quantum chromodynamics' Dyson-Schwinger equations. At an hadronic scale, both computed results are concave and significantly broader than asymptotic distribution amplitude, φ(π)(asy)(x)=6x(1-x); e.g., integral φ(π)(x)/φ(π)(asy)(x) is 1.8 simplest kernel 1.5 with more sophisticated kernel. Independent kernels, emergent phenomenon dynamical...
Studies of the structure excited baryons are key factors to N* program at Jefferson Lab (JLab). Within first year data taking with Hall B CLAS12 detector following 12 GeV upgrade, a dedicated experiment will aim extract electrocouplings high photon virtualities Q 2 . This allow exploration resonances highest ever achieved, kinematic reach up = high-Q make it possible probe nucleon structures distance scales ranging from where effective degrees freedom, such as constituent quarks, dominant...
Within contemporary hadron physics there are two common methods for determining the momentum-dependence of interaction between quarks: top-down approach, which works toward an ab initio computation via direct analysis gauge-sector gap equations; and bottom-up scheme, aims to infer by fitting data within a well-defined truncation those equations in matter sector that relevant bound-state properties. We unite these approaches demonstrating renormalisation-group-invariant running-interaction...
Visible matter is characterised by a single mass scale; namely, the proton mass. The proton’s existence and structure are supposed to be described quantum chromodynamics (QCD); yet, absent Higgs boson couplings, scale-invariant. Thus, if Standard Model truly part of theory Nature, then an emergent feature QCD; hadron (EHM) must provide basic link between observation. Nonperturbative tools necessary such connections made; in this context, we sketch recent progress application continuum...
Abstract A unified set of predictions for pion and kaon elastic electromagnetic gravitational form factors is obtained using a symmetry-preserving truncation each relevant quantum field equation. key part the study description salient aspects dressed graviton + quark vertices. The calculations reveal that meson’s mass radius smaller than its charge radius, matching available empirical inferences; meson core pressures are commensurate with those in neutron stars. analysis described herein...
An exact form is presented for the axial-vector Bethe-Salpeter equation, which valid when quark-gluon vertex fully dressed. A Ward-Takahashi identity kernel derived therefrom and solved a class of dressed quark-gluon-vertex models. The solution provides symmetry-preserving closed system gap equations. analysis can be extended to vector equation. This enables comparison between responses pseudoscalar scalar meson masses nonperturbatively dressing vertex. result indicates that dynamical chiral...
Elastic electromagnetic nucleon form factors have long provided vital information about the structure and composition of these most basic elements nuclear physics. The are a measurable physical manifestation nature nucleons' constituents dynamics that binds them together. Accurate factor data obtained in recent years using modern experimental facilities has spurred significant reevaluation pictures its structure; e.g., role quark orbital angular momentum, scale at which perturbative QCD...
Several phenomenological models of hadrons are derived from quantum chromodynamics (QCD). Functional-integral methods used to obtain an approximate bilocal-field representation the QCD generating functional. The degenerate vacuum configurations action for bilocal fields have a rich topological structure arising dynamically broken chiral symmetry. Restricting fluctuations those local results in local-field bosonization QCD, which we values several meson parameters. A nontopological-soliton...
We explain a form for the rainbow-ladder kernel whose momentum-dependence is consonant with modern DSE- and lattice-QCD results, assess its capability as tool in hadron physics. In every respect tested, this produces results observables that are at least equal to best otherwise obtained comparable approach. Moreover, it enables natural extraction of monotonic running-coupling -gluon-mass.
Using a quantum kinetic equation we study the possibility that focused beams at proposed x-ray free electron laser facilities can initiate spontaneous electron-positron pair production from QED vacuum. Under conditions reckoned achievable planned facilities, repeated cycles of particle creation and annihilation will take place in tune with frequency. The peak number density is insensitive to this frequency, one anticipate few hundred pairs per period.
A novel method is employed to compute the pion electromagnetic form factor, F_\pi(Q^2), on entire domain of spacelike momentum transfer using Dyson-Schwinger equation (DSE) framework in quantum chromodynamics (QCD). The DSE architecture unifies this prediction with that pion's valence-quark parton distribution amplitude (PDA). Using PDA, leading-order, leading-twist perturbative QCD result for Q^2 F_\pi(Q^2) underestimates full computation by just 15% Q^2>~8GeV^2, stark contrast obtained...
We introduce a method based on chiral susceptibility, which enables one to draw phase diagram in the chemical-potential--temperature plane for strongly interacting quarks whose interactions are described by any reasonable gap equation, even if diagrammatic content of quark-gluon vertex is unknown. locate critical end point at $({\ensuremath{\mu}}^{E},{T}^{E})\ensuremath{\sim}(1.0,0.9){T}_{c}$, where ${T}_{c}$ temperature chiral-symmetry restoration $\ensuremath{\mu}=0$, and find that domain...
We provide an experimental and theoretical perspective on the behavior of unpolarized distribution functions for nucleon pion valence-quark domain; namely, Bjorken-x \gtrsim 0.4. This domain is key to much hadron physics; e.g., a defined by its flavor content that property. Furthermore, accurate parametrization crucial provision reliable input large collider experiments. focus extractions via electron muon inelastic scattering, from Drell-Yan interactions; treatments emphasize explanation...
Perturbation theory predicts that a massless fermion cannot possess measurable magnetic moment. We explain, however, the nonperturbative phenomenon of dynamical chiral symmetry breaking generates momentum-dependent anomalous chromomagnetic moment for dressed light quarks, which is large at infrared momenta, and demonstrate consequently these same quarks also an electromagnetic with similar magnitude opposite sign.