Few-Body Systems

, Volume 46, Issue 1, pp 1–36

Survey of Nucleon Electromagnetic Form Factors


  • I. C. Cloët
    • Physics DivisionArgonne National Laboratory
    • Department of PhysicsUniversity of Washington
  • G. Eichmann
    • Physics DivisionArgonne National Laboratory
    • Institut für PhysikKarl-Franzens-Universität Graz
  • B. El-Bennich
    • Physics DivisionArgonne National Laboratory
  • T. Klähn
    • Physics DivisionArgonne National Laboratory
    • Physics DivisionArgonne National Laboratory
    • School of PhysicsThe University of New South Wales

DOI: 10.1007/s00601-009-0015-x

Cite this article as:
Cloët, I.C., Eichmann, G., El-Bennich, B. et al. Few-Body Syst (2009) 46: 1. doi: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 Poincaré 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; namely, 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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© US Government 2009