Chiral Symmetry and the Intrinsic Structure of the Nucleon

Abstract

Understanding hadron structure within the framework of QCD is an extremely challenging problem. In order to solve it, it is vital that our thinking should be guided by the best available insight. Our purpose here is to explain the model independent consequences of the approximate chiral symmetry of QCD for two famous results concerning the structure of the nucleon. We show that both the apparent success of the constituent quark model in reproducing the ratio of the proton to neutron magnetic moments and the apparent success of the Foldy term in reproducing the observed charge radius of the neutron are coincidental. That is, a relatively small change of the current quark mass would spoil both results.

RevTeX, 10 pages, 2 figures

Cited by in corpus (42)

• Nucleon Electromagnetic Form Factors
• Electromagnetic excitation of the Delta(1232)-resonance
• Nucleon electromagnetic form factors
• Aspects of Hadron Physics
• Nucleon Charge and Magnetization Densities from Sachs Form Factors
• Limits on the temporal variation of the fine structure constant, quark masses and strong interaction from quasar absorption spectra and atomic clock experiments
• Survey of nucleon electromagnetic form factors
• Nucleon electromagnetic form factors on the lattice and in chiral effective field theory
• Convergence of chiral effective field theory
• Nucleon mass and pion loops
• Experiments in Fundamental Neutron Physics
• Quark distributions in nuclear matter and the EMC effect
• Resolution of the Proton Spin Problem
• Leading Quenching Effects in the Proton Magnetic Moment
• Quark Contributions to Baryon Magnetic Moments in Full, Quenched and Partially Quenched QCD
• Chiral extrapolation of nucleon magnetic form factors
• Delta Baryon Magnetic Moments From Lattice QCD
• The nucleon and Delta-resonance masses in relativistic chiral effective-field theory
• Chiral extrapolation of octet-baryon charge radii
• Electroweak structure of the nucleon, meson cloud and light-cone wavefunctions
• Magnetic properties of the nucleon in a uniform background field
• Chiral Extrapolation of Hadronic Observables
• Nucleon electromagnetic form factors from lattice QCD
• Extrapolation of lattice QCD results beyond the power-counting regime
• Magnetic dipole moment of the S11(1535) from the γp \to γηp reaction
• Simple Quark Model with Chiral Phenomenology
• A Lattice Study of the Magnetic Moment and the Spin Structure of the Nucleon
• The Gell-Mann -- Okubo mass relation among baryons from fully-dynamical mixed-action lattice QCD
• The Spin of the Proton
• Spin and orbital angular momentum of the proton
• Current quark mass dependence of nucleon magnetic moments and radii
• An analysis of the nucleon spectrum from lattice partially-quenched QCD
• Solving the radial Dirac equations: a numerical odyssey
• Chiral QCD, General QCD Parameterization and Constituent Quark Models
• The electric form factor of the neutron and its chiral content
• Chiral extrapolation and physical insights
• The baryon octet magnetic moments to all orders in flavor breaking; an application to the problem of the strangeness in the nucleon
• Recent Developments in Quark Nuclear Physics
• Nucleon Form Factors: Probing the Chiral Limit
• The strangeness magnetic moment of the nucleon from FLIC fermions
• Nucleon Structure from Lattice QCD
• Strangeness contributions to nucleon form factors