Nucleon form factors: From the space-like to the time-like region

Details Nucleon form factors: From the space-like to the time-like region Nucleon form factors: From the space-like to the time-like region

1996-11-26

arxiv.org/abs/hep-ph/9611424v1

Nucl.Phys. A623 (1997) 340c-350c

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pp, LaTeX, uses epsf and espcrc1.sty, 6 figures, invited talk, DAPHCE 96, Frascati, November 1996, to appear in the proceed

Scientific paper

10.1016/S0375-9474(97)00453-3

I discuss how dispersion relations can be used to analyse the nucleon electromagnetic form factors, with particular emphasis on the constraints from unitarity and pQCD. Results for nucleon radii, vector-meson couplings, the onset of pQCD and bounds on the strangeness form factors are presented. The em form factors in the time-like region reveal some interesting physics which is not yet understood in full detail. The need for a better data basis at low, intermediate and large momentum transfer and also in the time-like region is stressed.

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