A5083642525- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Scientific Research and Discoveries
- Magnetic confinement fusion research
- Crystallography and Radiation Phenomena
- Cosmology and Gravitation Theories
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Noncommutative and Quantum Gravity Theories
- Electromagnetic Scattering and Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Advanced X-ray Imaging Techniques
- Electromagnetic Simulation and Numerical Methods
- Algebraic and Geometric Analysis
- Particle accelerators and beam dynamics
- Quantum and Classical Electrodynamics
Centre de Physique Théorique
2016-2025
École Polytechnique
2015-2024
Centre de Physique Théorique
2016-2024
Centre National de la Recherche Scientifique
2014-2023
University of Chinese Academy of Sciences
2022-2023
University of Science and Technology of China
2022-2023
Shanghai Institute of Applied Physics
2022-2023
Laboratoire d'Informatique de l'École Polytechnique
2023
Thomas Jefferson National Accelerator Facility
2023
Mississippi State University
2022
We study the Wigner functions of nucleon which provide multidimensional images quark distributions in phase space. These can be obtained through a Fourier transform transverse space generalized transverse-momentum dependent parton distributions. They depend on both position and three-momentum relative to nucleon, therefore combine single picture all information contained focus discussion unpolarized/longitudinally polarized an nucleon. In this way, we role orbital angular momentum shaping...
We investigate the quark orbital angular momentum of nucleon in absence gauge-field degrees freedom, by using concept Wigner distribution and light-cone wave functions Fock-state expansion nucleon. The is obtained from phase-space average operator weighted with unpolarized quarks a longitudinally polarized also derive wave-function representation momentum. In particular, we perform an space decompose into $N$-parton state contributions. Explicit expressions are presented terms three-quark...
The gravitational form factors encode fundamental particle properties including mass, spin, and $D$-term. Their physical interpretation promises, for composed particles, insights on spatial distributions of energy, angular momentum, internal forces. This Colloquium reviews the theoretical recent experimental advances in this field with focus quark-gluon structure proton QCD.
We discuss in detail the spatial distribution of angular momentum inside nucleon. show that discrepancies between different definitions originate from terms integrate to zero. Even though these can safely be dropped at integrated level, they have taken into account density level. Using scalar diquark model, we illustrate our results and, for first time, check explicitly equivalence kinetic and canonical orbital persists as expected a system without gauge degrees freedom.
We discuss in detail the distributions of energy, radial pressure and tangential inside nucleon. In particular, this discussion is carried on both instant form front dynamics. Moreover we show for first time how these mechanical concepts can be defined when average nucleon momentum does not vanish. express conditions hydrostatic equilibrium stability terms two three-dimensional energy distributions. briefly phenomenological relevance our findings with a simple yet realistic model. light...
An effective supersymmetric QCD light-front Hamiltonian for hadrons composed of light quarks, which includes a spin-spin interaction between the hadronic constituents, is constructed by embedding superconformal quantum mechanics into AdS space. A specific breaking conformal symmetry inside graded algebra determines unique quark-confining potential hadrons, as well remarkable connections meson and baryon spectra. The results are consistent with empirical features light-quark hadron spectra,...
Relativistic charge distributions of targets with arbitrary average momentum are introduced. They provide an interpolation between the usual Breit frame and infinite-momentum distributions. We find that can be interpreted from a phase-space perspective as internal quasi-densities in rest localized target, without any relativistic correction. show also apparent discrepancies simply result kinematical artifacts associated spin.
A bstract We review and examine in detail recent developments regarding the question of nucleon mass decomposition. discuss particular virial theorem quantum field theory its implications for decomposition mechanical equilibrium. reconsider renormalization QCD energy-momentum tensor minimal-subtraction-type schemes physical interpretation components, as well role played by trace anomaly Poincaré symmetry. also study concept “quantum anomalous energy” proposed some works a new contribution to...
Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National Laboratory on Long Island, New York by the United States Department of Energy. EIC will provide capabilities colliding beams polarized electrons with proton and light ions. be one largest most sophisticated new facilities worldwide, only large-scale in next few decades. The versatility, resolving power intensity present many opportunities to address some crucial fundamental open...
As a follow up of our work on the electromagnetic four-current, we study for first time relativistic polarization and magnetization spatial distributions inside spin-$\frac{1}{2}$ target within quantum phase-space approach. While polarization-magnetization tensor is usually defined in terms Gordon decomposition Breit frame analysis reveals that physically simpler more natural picture system arises when instead Sachs decomposition. Relativistic moving are compared with their light-front...
A bstract We analyze the structure of generalized off-diagonal and transverse-momentum dependent quark-quark gluon-gluon correlators for a spin-1/2 hadron. Using light-front formalism, we provide parametrization in terms parton distributions that emphasizes multipole correlator. The results correlation functions are consistent with an alternative given Lorentz covariant structures. correlator is presented first time allows one to introduce new which can be relevant phenomenological applications.
We discuss in detail and from the geometrical point of view issues gauge invariance Lorentz covariance raised by approach proposed recently Chen et al. to proton spin decomposition. show that this follows a mechanism similar one used famous Stueckelberg trick. Stressing fact symmetry does not force potential transform as four-vector, we is covariant provided uses suitable transformation law. also make an attempt summarize present situation concerning argue ongoing debates concern essentially...
Transverse-momentum dependent parton distributions (TMDs) are studied in the framework of quark models. In particular, quark-model relations among TMDs reviewed, elucidating their physical origin terms quark-spin structure nucleon. The formal aspects derivation these complemented with explicit examples, emphasizing how and to which extent conditions lead implemented different classes
Generalized transverse-momentum dependent parton distributions (GTMDs) encode the most general structure of hadrons. Here we focus on two twist-2 GTMDs which are denoted by ${F}_{1,4}$ and ${G}_{1,1}$ in parts literature. As already shown previously, both have a close relation to orbital angular momentum partons inside hadron. However, recently even mere existence has been doubted. We explain why this claim does not hold. support our model-independent considerations calculating scalar...
We review what is currently known about the gluon Sivers distribution and are opportunities to learn more it. Because single transverse spin asymmetries in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:msup><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>↑</mml:mo></mml:mrow></mml:msup><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mi>π</mml:mi><mml:mi>X</mml:mi></mml:math>provide only indirect information function through relation with quark-gluon tri-gluon...
We provide the complete decomposition of local gauge-invariant energy-momentum tensor for spin-1 hadrons, including non-conserved terms individual parton flavors and antisymmetric contributions originating from intrinsic spin. state sum rules gravitational form factors appearing in this relations mass decomposition, work balance, total orbital angular momentum, radius, inertia tensor. Generalizing earlier work, we derive between momentum Mellin moments twist-2 3 generalized distributions,...
We argue that the standard decompositions of hadron mass overlook pressure effects, and hence should be interpreted with great care. Based on semiclassical picture, we propose a new decomposition properly accounts for these effects. Because Lorentz covariance, stress automatically comes along stability constraint, which discuss first time. show also if is seen as made quarks gluons, one cannot decompose its into more than two contributions without running trouble consistency physical...
We study the structure of scalar, vector, and tensor currents for on-shell massive particles any spin. When considering higher values spin particle, number form factors (FFs) involved in decomposition matrix elements associated with these local increases. identify all fundamental structures that give rise to independent FFs, systematically value. These can be conveniently organised using an expansion covariant multipoles, built solely from Lorentz generators. This approach allows one...