Electromagnetic excitation of nucleon resonances

Review

Abstract

Recent progress on the extraction of electromagnetic properties of nucleon resonance excitation through pion photo- and electroproduction is reviewed. Cross section data measured at MAMI, ELSA, and CEBAF are analyzed and compared to the analysis of other groups. On this basis, we derive longitudinal and transverse transition form factors for most of the four-star nucleon resonances. Furthermore, we discuss how the transition form factors can be used to obtain empirical transverse charge densities. Contour plots of the thus derived densities are shown for the Delta, Roper, S 11, and D 13 nucleon resonances.

Keywords

Form Factor European Physical Journal Special Topic Helicity Amplitude Transition Form Factor Magnetic Form Factor 

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Copyright information

© EDP Sciences and Springer 2011

Authors and Affiliations

  1. 1.Institut für KernphysikJohannes Gutenberg-UniversitätMainzGermany
  2. 2.Laboratory of Theoretical Physics, JINR DubnaMoscow RegionRussia

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