Survey of nucleon electromagnetic form factors

Details Survey of nucleon electromagnetic form factors Survey of nucleon electromagnetic form factors

2008-12-02

arxiv.org/abs/0812.0416v1

Few Body Syst.46:1-36,2009

Physics

Nuclear Physics

Nuclear Theory

43 pages, 17 figures, 12 tables, 5 appendices

Scientific paper

10.1007/s00601-009-0015-x

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.

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