Interpretation of the Flavor Dependence of Nucleon Form Factors in a Generalized Parton Distribution Model

Abstract

We give an interpretation of the $u$ and $d$ quarks contributions to the nucleon electromagnetic form factors for values of the four-momentum transfer in the multi-GeV region where flavor separated data have been recently made available. The data show, in particular, a suppression of $d$ quarks with respect to $u$ quarks at large momentum transfer. %and constant ratios of the flavor dependent Pauli to Dirac form factors ratios. This trend can be explained using a reggeized diquark model calculation of generalized parton distributions, thus providing a correlation between momentum and coordinate spaces, both of which are necessary in order to interpret the partonic substructure of the form factors. We extend our discussion to the second moments of generalized parton distributions which are believed to contribute to partonic angular momentum.

arXiv comment22 pages, 19 figures; results and figures added and changed, tables added, formulae added, major rewriting of text

References in corpus (61)

• Wave Functions, Evolution Equations and Evolution Kernels from Light-Ray Operators of QCD
• Generalized Parton Distributions
• Deeply Virtual Compton Scattering
• Nonforward Parton Distributions
• Unraveling hadron structure with generalized parton distributions
• Factorization for hard exclusive electroproduction of mesons in QCD
• The ratio of proton's electric to magnetic form factors measured by polarization transfer
• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
• Impact Parameter Space Interpretation for Generalized Parton Distributions
• High-precision determination of the electric and magnetic form factors of the proton
• Charge Density of the Neutron
• Nucleon Form Factors from Generalized Parton Distributions
• Transverse-momentum distributions in a diquark spectator model
• Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
• Nucleon structure from mixed action calculations using 2+1 flavors of asqtad sea and domain wall valence fermions
• Nucleon electromagnetic form factors
• High Precision Measurement of the Proton Elastic Form Factor Ratio ${\mu }_p{G}_E/G_M$ at low $Q^2$
• Precise Neutron Magnetic Form Factors
• The Charge Form Factor of the Neutron from the Reaction \pol{2H}(\pol{e},e'n)p
• Deeply Virtual Compton Scattering Beam-Spin Asymmetries
• Nonforward parton densities and soft mechanism for form factors and wide-angle Compton scattering in QCD
• Evolution and models for skewed parton distributions
• Final Analysis of Proton Form Factor Ratio Data at ${\mathbf{Q}}^2=4.0$, 4.8 and 5.6 GeV${}^2$
• A Measurement of the Electric Form Factor of the Neutron through $\vec{d}(\vec{e},e^{\prime }n)p$ at $Q^2=0.5$ (GeV/c)${}^2$
• Measurements of GEn/GMn from the ^2H(vec{e},e'vec{n})^1H Reaction to Q^2=1.45 (GeV/c)^2
• Measurement of the Electric Form Factor of the Neutron at Q^2=0.5 and 1.0 (GeV/c)^2
• Hadron structure from lattice quantum chromodynamics
• The Transverse Asymmetry ${\mathbf{A}}_{{\mathbf{T}}^{\prime }}$ from Quasi-elastic ${}^3\overrightarrow{\mathrm{He}}(\vec{e},e^{\prime })$ Process and the Neutron Magnetic Form Factor
• Flavor decomposition of the elastic nucleon electromagnetic form factors
• Nucleon form factors, generalized parton distributions and quark angular momentum
• Measurement of the Electric Form Factor of the Neutron at Q^2 = 0.3-0.8 (GeV/c)^2
• Survey of nucleon electromagnetic form factors
• Transverse Charge Densities
• Extraction of electromagnetic neutron form factors through inclusive and exclusive polarized electron scattering on polarized 3He target
• Measurements of the Electric Form Factor of the Neutron up to Q2=3.4 GeV2 using the Reaction He3(e,e'n)pp
• Parton Distribution Benchmarking with LHC Data
• The neutron charge form factor and target analyzing powers from pol.3He(pol e,e'n)-scattering
• Nucleon and Roper electromagnetic elastic and transition form factors
• Neutron charge form factor at large $q^2$
• Interplay of Spin and Orbital Angular Momentum in the Proton
• Status on nucleon electromagnetic form factors
• New empirical fits to the proton electromagnetic form factors
• Low Q^2 measurements of the proton form factor ratio $m{u}_p{G}_E/G_M$
• Flexible Parametrization of Generalized Parton Distributions from Deeply Virtual Compton Scattering Observables
• Constraining quark angular momentum through semi-inclusive measurements
• Measurements of the neutron electric to magnetic form factor ratio GEn/GMn via the ^2H(\vec{e},e'\vec{n})^1H reaction to Q^2 = 1.45 (GeV/c)^2
• PWIA Extraction of the Neutron Magnetic Form Factor from Quasi-Elastic 3He(e,e') at Q^2 = 0.3 to 0.6 (GeV/c)^2
• Measurement of Azimuthal Asymmetries With Respect To Both Beam Charge and Transverse Target Polarization in Exclusive Electroproduction of Real Photons
• A Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron
• Off-diagonal parton distributions and their evolution
• Flavor decomposition of the nucleon electromagnetic form factors
• Nucleon form factors and spin content in a quark-diquark model with a pion cloud
• Separation of contributions from deeply virtual Compton scattering and its interference with the Bethe--Heitler process in measurements on a hydrogen target
• Generalized Parton Distributions and Their Singularities
• Singular Charge Density at the Center of the Pion?
• Generalized Parton Distributions from Hadronic Observables: Zero Skewness
• Measurement of the neutron electric to magnetic form factor ratio at Q2 = 1.58 GeV2 using the reaction 3He(e,e'n)pp
• The Role of Mesons in the Electromagnetic Form Factors of the Nucleon
• Generalized Parton Distributions from Hadronic Observables: Non-Zero Skewness
• The neutron negative central charge density: an inclusive-exclusive connection
• Generalized Parton Distributions and Color Transparency

Cited by in corpus (34)

• GPD phenomenology and DVCS fitting - Entering the high-precision era
• Parton distributions and lattice QCD calculations: toward 3D structure
• Diquark Correlations in Hadron Physics: Origin, Impact and Evidence
• Universality of Generalized Parton Distributions in Light-Front Holographic QCD
• The Spin Structure of the Nucleon
• Analysis of nucleon electromagnetic form factors from light-front holographic QCD : The spacelike region
• Single and double spin asymmetries for deeply virtual Compton scattering measured with CLAS and a longitudinally polarized proton target
• Longitudinal target-spin asymmetries for deeply virtual Compton scattering
• Moments of proton GPDs from the OPE of nonlocal quark bilinears up to NNLO
• First Exclusive Measurement of Deeply Virtual Compton Scattering off ${}^4$He: Toward the 3D Tomography of Nuclei
• Nucleon elastic form factors at accessible large spacelike momenta
• Generalized parton distributions through universal moment parameterization: zero skewness case
• Generalized parton distributions through universal moment parameterization: non-zero skewness case
• Parton Transverse Momentum and Orbital Angular Momentum Distributions
• Models of parton distributions and the description of form factors of nucleon
• Generalized parton distributions at zero skewness
• Determination of the generalized parton distributions through the analysis of the world electron scattering data considering two-photon exchange corrections
• Transverse charge and magnetization densities in holographic QCD
• Exclusive J/psi and Upsilon photoproduction and the low x gluon
• In-Medium Pion Valence Distributions in a Light-Front Model
• Twist-three cross-sections in deeply virtual Compton scattering
• Form factors and transverse charge and magnetization densities in the hard-wall AdS/QCD model
• Measurement of deeply virtual Compton scattering off Helium-4 with CLAS at Jefferson Lab
• Impact of JLab data on the determination of GPDs at zero skewness and new insights from transition form factors $N\to \Delta$
• On Extraction of Twist-Two Compton Form Factors from DVCS Observables Through Harmonic Analysis
• A Euclidean bridge to the relativistic constituent quark model
• Generalized parton distributions of sea quark at zero skewness in the light-cone Model
• Partonic Structure of Light Nuclei
• Flavour structure of the nucleon electromagnetic form factors and transverse charge densities in the chiral quark-soliton model
• The structure of nucleons and the description of the electromagnetic form factors
• Observations of Chiral Odd GPDs and their Implications
• Parametrization of Quark and Gluon Generalized Parton Distributions in a Dynamical Framework
• Deeply virtual Compton scattering off the neutron
• Flavor dependence of the spin-independent and spin-dependent parts of $GDPs(x,t,\xi =0)$