GPD phenomenology and DVCS fitting - Entering the high-precision era

Abstract

We review the phenomenological framework for accessing Generalized Parton Distributions (GPDs) using measurements of Deeply Virtual Compton Scattering (DVCS) from a proton target. We describe various GPD models and fitting procedures, emphasizing specific challenges posed both by the internal structure and properties of the GPD functions and by their relation to observables. Bearing in mind forthcoming data of unprecedented accuracy, we give a set of recommendations to better define the pathway for a precise extraction of GPDs from experiment.

32 pages, 10 figures, contribution to the EPJA topical issue on 3D Structure of the Nucleon

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• Refined analysis of photon leptoproduction off spinless target
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• Large-Momentum Effective Theory
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• 50 Years of Quantum Chromodynamics
• Parton distributions and lattice QCD calculations: toward 3D structure
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Gluon gravitational form factors of the nucleon and the pion from lattice QCD
• The proton charge radius
• Unpolarized and helicity generalized parton distributions of the proton within lattice QCD
• Gluon gravitational structure of hadrons of different spin
• Event Generators for High-Energy Physics Experiments
• The x-dependence of hadronic parton distributions: A review on the progress of lattice QCD
• The deconvolution problem of deeply virtual Compton scattering
• The Present and Future of QCD
• Unbiased determination of DVCS Compton Form Factors
• Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Unpolarized Quarks
• Phenomenological assessment of proton mechanical properties from deeply virtual Compton scattering
• A Glimpse of Gluons through Deeply Virtual Compton Scattering on the Proton
• Border and skewness functions from a leading order fit to DVCS data
• Transversity GPDs of the proton from lattice QCD
• Generalized quasi parton distributions in a diquark spectator model
• Exclusive production of a pair of high transverse momentum photons in pion-nucleon collisions for extracting generalized parton distributions
• Nucleon generalized form factors from two-flavor lattice QCD
• Covariant Extension of the GPD overlap representation at low Fock states
• Transverse Extension of Partons in the Proton probed by Deeply Virtual Compton Scattering
• Extraction of Generalized Parton Distribution Observables from Deeply Virtual Electron Proton Scattering Experiments
• How well do we know the gluon polarization in the proton?
• Gluon Gravitational Form Factors at Large Momentum Transfer
• The relativistic center of mass in field theory with spin
• Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO
• Perturbative Calculations of Gravitational Form Factors at Large Momentum Transfer
• Analysis of Deeply Virtual Compton Scattering Data at Jefferson Lab and Proton Tomography
• Exploring twist-2 GPDs through quasi-distributions in a diquark spectator model
• Effects of long-range forces on the D-term and the energy-momentum structure
• Testing momentum dependence of the nonperturbative hadron structure in a global QCD analysis
• $\rho$ meson unpolarized generalized parton distributions with a light-front constituent quark model
• First-time measurement of Timelike Compton Scattering
• Transverse-momentum-dependent parton distribution functions up to twist 4 for spin-1 hadrons
• Hard exclusive pion electroproduction at backward angles with CLAS
• Twist-3 GPDs in Deeply-Virtual Compton Scattering
• Nucleon resonances in Compton scattering
• Generalized parton distributions at zero skewness
• Lorentz Invariance and QCD Equation of Motion Relations for Generalized Parton Distributions and the Dynamical Origin of Proton Orbital Angular Momentum
• An introductory lecture on Generalised Parton Distributions
• Generalised parton distributions from the off-forward Compton amplitude in lattice QCD
• Pion Valence-Quark Generalized Parton Distribution at Physical Pion Mass
• Exclusive neutrino-production of a charmed meson
• Multidifferential study of identified charged hadron distributions in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=$13 TeV
• Continuum limit of parton distribution functions from the pseudo-distribution approach on the lattice
• Deep Learning Analysis of Deeply Virtual Exclusive Photoproduction
• Progress and Opportunities in Backward angle (u-channel) Physics
• Diffractive deeply virtual Compton scattering
• Monopole and quadrupole contributions to the angular momentum density
• Study of kaon structure using the light-cone quark model
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• Nucleon axial form factor from generalized parton distributions
• Exclusive production of quarkonia pairs in collinear factorization framework
• Gluon transversity in polarized proton-deuteron Drell-Yan process
• Gluon contribution to the mechanical properties of a dressed quark in light-front Hamiltonian QCD
• Moments of Axial-Vector GPD from Lattice QCD: Quark Helicity, Orbital Angular Momentum, and Spin-Orbit Correlation
• NLO corrections to the deeply virtual meson production revisited: impact on the extraction of generalized parton distributions
• Generalized parton distributions from the pseudo-distribution approach on the lattice
• Determination of generalized parton distributions through a simultaneous analysis of axial form factor and wide-angle Compton scattering data
• u-Channel Color Transparency Observables
• Artificial neural network modelling of generalised parton distributions
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• Dispersive Determination of Nucleon Gravitational Form Factors
• QCD angular momentum in $N\to \Delta$ transitions
• Parametrization of GPDs from t-channel string exchange in AdS spaces
• On Extraction of Twist-Two Compton Form Factors from DVCS Observables Through Harmonic Analysis
• Deuteron polarizations in the proton-deuteron Drell-Yan process for finding the gluon transversity
• Hard exclusive neutrino production of a light meson
• Effects of next-to-leading order DGLAP evolution on generalized parton distributions of the proton and deeply virtual Compton scattering at high energy
• String-based parametrization of nucleon GPDs at any skewness: a comparison to lattice QCD
• Nucleon tensor form factors in a relativistic confined quark model
• Generalized parton distributions of sea quarks in the proton from nonlocal chiral effective theory
• Generalized parton distributions of sea quark at zero skewness in the light-cone Model
• Impact of a positron beam at JLab on an unbiased determination of DVCS Compton Form Factors
• Improved determination of $\bar{d}(x)-\bar{u}(x)$ flavor asymmetry in the proton by BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai
• Leading-order QED radiative corrections to timelike Compton scattering on the proton
• Accessing Generalized Parton Distributions in Exclusive Photoproduction of a $\gamma \rho$ Pair with a Large Invariant Mass
• Exclusive photoproduction of ${\eta }_c\gamma$ pairs with large invariant mass
• Deep-Inelastic Scattering at TeV Energies with LHC Muons
• Six-dimensional light-front Wigner distributions of the proton
• Deciphering Twist-3 Chiral-Even GPDs in the Light-Front Quark-Diquark Model
• Study of deeply virtual Compton scattering at the future Electron-Ion Collider
• Accessing Compton Form Factors at the Electron Ion Collider in China: An Impact study on $\text{Im}\mathcal{E}$
• Nucleon tomography. What can we do better today than Rutherford 100 years ago?
• Energy, angular momentum and pressure force distributions inside nucleons
• Generalized Parton Distributions from Lattice QCD with Asymmetric Momentum Transfer: Unpolarized Quarks at Nonzero Skewness
• Energy-momentum tensor form factor D(t) of proton and neutron
• Soft-photon radiative corrections to the $e^{-}p\to e^{-}p{l}^{-}{l}^{+}$ process
• Sum rules for the Gravitational Form Factors using light-front dressed quark state
• Unified and optimal frame choice for generalized parton distributions
• Determination of the pion generalized parton distributions at zero skewness
• Revisiting evolution equations for generalised parton distributions
• A Unified Neural-Network Framework for Nucleon Imaging from Numerical Simulations of QCD
• Rapidity-Dependent Spin Decomposition of the Nucleon
• A model-independent framework for determining finite-volume effects of spatially nonlocal operators
• Global Analyses of Generalized Parton Distributions with Diverse PDF Inputs
• New framework for extracting GPDs from exclusive photon electroproduction
• Conference Summary of QNP2018
• Deeply virtual Compton scattering using a positron beam in Hall-C at Jefferson Lab
• On the equivalence of GPD representations
• Parametrization of Quark and Gluon Generalized Parton Distributions in a Dynamical Framework