Nucleon electromagnetic structure revisited

1 February 2003

journal article
Published by IOP Publishing in Journal of Physics G: Nuclear and Particle Physics

Vol. 29 (2) , 405-429
https://doi.org/10.1088/0954-3899/29/2/316

Abstract

Unitary and analytic ten-resonance model of the nucleon electromagnetic (e.m.) struc- ture with canonical normalizations and QCD (up to the logarithmic correction) asymp- totics is constructed on the four-sheeted Riemann surface, which provides a superposition of vector-meson pole and continuum contributions in a very natural way. As a result it describes simultaneously all existing experimental space-like and time-like data on the proton e.m. form factors (ff's) and on the neutron e.m. ff's as well. A crucial factor in the latter achievement is the inclusion of a contribution of the fourth excited state of the �(770) meson with the parameters m�'''' = 2455 ± 53MeV, �'''' = 728 ± 2MeV and

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