Nucleon form factors in dispersion theory
Helmholtz-Institut für Strahlen- und Kernhysik (Theorie), Universität Bonn, Nussallee 14-16, D-53115, Bonn, Germany
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Accepted: 10 May 2006
Published online: 11 May 2006
Dispersion relations provide a powerful tool to analyse the electromagnetic form factors of the nucleon in both the space-like and the time-like regions with constraints from other experiments, unitarity, and perturbative QCD. We give a brief introduction into dispersion theory for nucleon form factors and present first results from our ongoing form factor analysis. We also calculate the two-pion continuum contribution to the isovector spectral functions drawing upon the new high statistics measurements of the pion form factor by the CMD-2, KLOE, and SND collaborations.
PACS: 11.55.Fv Dispersion relations – / 13.40.Gp Electromagnetic form factors – / 14.20.Dh Protons and neutrons –
© Società Italiana di Fisica and Springer-Verlag, 2006