Survey of nucleon electromagnetic form factors

Abstract

A dressed-quark core contribution to nucleon electromagnetic form factors is calculated. It is defined by the solution of a Poincare' covariant Faddeev equation in which dressed-quarks provide the elementary degree of freedom and correlations between them are expressed via diquarks. The nucleon-photon vertex involves a single parameter; i.e., a diquark charge radius. It is argued to be commensurate with the pion's charge radius. A comprehensive analysis and explanation of the form factors is built upon this foundation. A particular feature of the study is a separation of form factor contributions into those from different diagram types and correlation sectors, and subsequently a flavour separation for each of these. Amongst the extensive body of results that one could highlight are: r_1^{n,u}>r_1^{n,d}, owing to the presence of axial-vector quark-quark correlations; and for both the neutron and proton the ratio of Sachs electric and magnetic form factors possesses a zero.

43 pages, 17 figures, 12 tables, 5 appendices

References in corpus (21)

• Nucleon Electromagnetic Form Factors
• Charge Density of the Neutron
• Nucleon electromagnetic form factors
• Hadron Properties and Dyson-Schwinger Equations
• Scaling behavior and positivity violation of the gluon propagator in full QCD
• Aspects of Hadron Physics
• Vector meson form factors and their quark-mass dependence
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• Extraction and Interpretation of gamma N --> Delta Form Factors within a Dynamical Model
• Dynamical chiral symmetry breaking and a critical mass
• Chiral extrapolation of nucleon magnetic form factors
• Mind the gap
• Electromagnetic nucleon form factors in instant and point form
• The neutron negative central charge density: an inclusive-exclusive connection
• The Spin of the Proton
• Covariance, Dynamics and Symmetries, and Hadron Form Factors
• Current quark mass dependence of nucleon magnetic moments and radii
• Dynamics, Symmetries and Hadron Properties
• Form Factors and Dyson-Schwinger Equations

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• Unified description of hadron-photon and hadron-meson scattering in the Dyson-Schwinger approach
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