$Q^2$ Independence of $Q{F}_2/F_1$, Poincare Invariance and the Non-Conservation of Helicity

Abstract

A relativistic constituent quark model is found to reproduce the recent data regarding the ratio of proton form factors, $F_2(Q^2)/F_1(Q^2)$. We show that imposing Poincare invariance leads to substantial violation of the helicity conservation rule, as well as an analytic result that the ratio $F_2(Q^2)/F_1(Q^2)\sim 1/Q$ for intermediate values of $Q^2$.

arXiv comment13 pages, 7 figures, to be submitted to Phys. Rev. C typos corrected, references added, 1 new figure to show very high Q^2 behavior

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• Measurement of GEp/GMp in ep -> ep to Q2 = 5.6 GeV2
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• Rotational covariance and light-front current matrix elements
• Beta decay of hyperons in a relativistic quark model
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Cited by in corpus (59)

• Generalized Parton Distributions
• Baryons as relativistic three-quark bound states
• Nucleon Electromagnetic Form Factors
• Proton elastic form factor ratios to $Q^2$ = 3.5 GeV${}^2$ by polarization transfer
• Nucleon electromagnetic form factors
• High Precision Measurement of the Proton Elastic Form Factor Ratio ${\mu }_p{G}_E/G_M$ at low $Q^2$
• Precision Measurement of the Neutron Spin Asymmetries and Spin-dependent Structure Functions in the Valence Quark Region
• Perturbative QCD Analysis of the Nucleon's Pauli Form Factor F_2(Q^2)
• The Spin Structure of the Proton
• Final Analysis of Proton Form Factor Ratio Data at ${\mathbf{Q}}^2=4.0$, 4.8 and 5.6 GeV${}^2$
• Electromagnetic Form Factors of the Nucleon and Compton Scattering
• Aspects of Hadron Physics
• Light Front Cloudy Bag Model: Nucleon Electromagnetic Form Factors
• Flavor decomposition of the elastic nucleon electromagnetic form factors
• Nucleon Charge and Magnetization Densities from Sachs Form Factors
• Nucleon electromagnetic form factors from the covariant Faddeev equation
• Precision Measurement of the Neutron Spin Asymmetry $A_1^n$ and Spin-Flavor Decomposition in the Valence Quark Region
• Measurement of the proton electric to magnetic form factor ratio from \vec ^1H(\vec e, e'p)
• 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
• Polarization Transfer Observables in Elastic Electron Proton Scattering at $Q^2=$2.5, 5.2, 6.8, and 8.5 GeV${}^2$
• Three-Quark Light-Cone Amplitudes of The Proton And Quark-Orbital-Motion Dependent Observables
• The covariant structure of light-front wave functions and the behavior of hadronic form factors
• Analysis of nucleon electromagnetic form factors from light-front holographic QCD : The spacelike region
• Counting Rule for Hadronic Light-Cone Wave Functions
• Single-Spin Polarization Effects and the Determination of Timelike Proton Form Factors
• Baryon Form Factors of Relativistic Constituent-Quark Models
• Shapes of the Proton
• Understanding the nucleon as a Borromean bound-state
• Improved Light-Cone Sum Rules for the Electromagnetic Form Factors of the Nucleon
• Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei
• Cross Section Measurements of Charged Pion Photoproduction in Hydrogen and Deuterium from 1.1 to 5.5 GeV
• Hadron structure at low Q^2
• Nucleon elastic form factors at accessible large spacelike momenta
• Transverse target spin asymmetry in inclusive DIS with two-photon exchange
• Densities, Parton Distributions, and Measuring the Non-Spherical Shape of the Nucleon
• QCD Form Factors and Hadron Helicity Non-Conservation
• Angular Conditions,Relations between Breit and Light-Front Frames, and Subleading Power Corrections
• Near-threshold $\omega$ and $\varphi$ meson productions in $pp$ collisions
• Form Factors and Two-Photon Exchange in High-Energy Elastic Electron-Proton Scattering
• Handling the Handbag Diagram in Compton Scattering on the Proton
• Prospects for e+e- physics at Frascati between the phi and the psi
• Study of Lattice QCD Form Factors Using the Extended Gari-Krumpelmann Model
• Comparison of Nucleon Form Factors from Lattice QCD Against the Light Front Cloudy Bag Model and Extrapolation to the Physical Mass Regime
• Shapes of the Nucleon
• Asymptotic behavior of nucleon electromagnetic form factors in time-like region
• Gauge invariant reduction to the light-front
• Study of the in-medium nucleon electromagnetic form factors using a light-front nucleon wave function combined with the quark-meson coupling model
• Nucleon form factors and parton distributions in nonlocal chiral effective theory
• Unified model of nucleon elastic form factors and implications for neutrino-oscillation experiments
• Neutron Electromagnetic Form Factors
• Non-Spherical Shapes of the Proton: Existence, Measurement and Computation
• Effect of gluon-exchange pair-currents on the ratio G(E(P))/G(M(P))
• Connection between the elastic GEp/GMp and P to Delta form factors
• Magnetization screening from gluonic currents and scaling law violation in the ratio of magnetic form factors for neutron and proton
• The Dirac Form Factor Predicts the Pauli Form Factor in the Endpoint Model
• Subtleties of Lorentz Invariance in Relativistic Constituent Quark Models of the Nucleon and the Spin-Dependent Quark Density
• Ratio of the proton electromagnetic form factors from meson dressing
• Model independent results for nucleon structure
• Nucleon axial-vector form factor and radius from future neutrino experiments