Time- and Spacelike Nucleon Electromagnetic Form Factors beyond Relativistic Constituent Quark Models

Abstract

For the first time, a phenomenological analysis of the experimental electromagnetic form factors of the nucleon, both in the timelike and spacelike regions, is performed by taking into account the effects of nonvalence components in the nucleon state, within a light-front framework. Our model, based on suitable Ansatzes for the nucleon Bethe-Salpeter amplitude and a microscopic version of the well-known Vector Meson Dominance model, has only four free parameters (determined by the spacelike data with ${\chi }^2/datum\sim 1.7$), and yields a nice description of the experimental electromagnetic form factors in the physical region in the range $-30(GeV/c{)}^2<q^2<20(GeV/c{)}^2$, except for the neutron one in the timelike region. Valuable information can be gained in the timelike region on possible missing Vector Mesons around $q^2\sim 4.5(GeV/c{)}^2$ and $q^2\sim 8.0(GeV/c{)}^2$

11 pages, 4 figures. Changed .sty, and added more details. PLB in press

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Cited by in corpus (31)

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• Recoil Polarization Measurements of the Proton Electromagnetic Form Factor Ratio to Q^2 = 8.5 GeV^2
• High Precision Measurement of the Proton Elastic Form Factor Ratio ${\mu }_p{G}_E/G_M$ at low $Q^2$
• Final Analysis of Proton Form Factor Ratio Data at ${\mathbf{Q}}^2=4.0$, 4.8 and 5.6 GeV${}^2$
• Study of e+e- --> p anti-p via initial-state radiation at BABAR
• Low Q^2 measurements of the proton form factor ratio $m{u}_p{G}_E/G_M$
• Pion Generalized Parton Distributions with covariant and Light-front constituent quark models
• Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2=$2.5, 5.2, 6.8, and 8.5 GeV${}^2$
• The electromagnetic form factors of the proton in the timelike region
• Nucleon Electromagnetic Form Factors in the Timelike Region
• Unquenched quark model for baryons: magnetic moments, spins and orbital angular momenta
• Nucleon Form Factors and Distribution Amplitudes in QCD
• The valence quark, sea, and gluon content of the pion from the parton distribution functions and the electromagnetic form factor
• Pion Generalized Parton Distributions within a fully covariant constituent quark model
• Projecting the Bethe-Salpeter Equation onto the Light-Front and back: A Short Review
• Electromagnetic form factors of the $\Lambda$ and $\Sigma$ baryons in an alternative baryonic current approach
• High $Q^2$ behavior of the electromagnetic form factors in the relativistic hypercentral CQM
• Timelike nucleon electromagnetic form factors: All about interference of isospin amplitudes
• Pseudoscalar mesons with symmetric bound state vertex functions on the light front
• Proton Electromagnetic Form Factors in the Time-like Region through the Scan Technique
• Generalized parton distributions in spin-3/2 particles
• On the form factors of $d^{\ast }(2380)$
• Light-Front Spin-1 Model: Parameters Dependence
• Electromagnetic form factors of ${\Lambda }_b$ in the Bethe-Salpeter equation approach
• Study of the in-medium nucleon electromagnetic form factors using a light-front nucleon wave function combined with the quark-meson coupling model
• Representations of relativistic particles of arbitrary spin in Poincaré, Lorentz, and Euclidean covariant formulations of relativistic quantum mechanics
• The Proton Form Factor Ratio Measurements at Jefferson Lab
• Exploring the Pion phenomenology within a fully covariant constituent quark model
• Light-front quark distributions in the nucleon and nucleon electromagnetic form factors
• Electromagnetic form factors of ${\Lambda }_c$ in the Bethe-Salpeter equation approach
• Tortuous ways to the extraction of neutron observables from inclusive lepton scattering