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Article Dans Une Revue European Physical Journal A Année : 2005

Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions

Résumé

We perform a global analysis of the experimental data of the electromagnetic nucleon form factors, in space-like and time-like regions. We give the expressions of the observables in annihilation processes, such as $p+\bar{p}\to \ell^+ +\ell^- $, $\ell=e$ or $\mu$, in terms of form factors. We discuss some of the phenomenological models proposed in the literature for the space-like region, and consider their analytical continuation to the time-like region. After determining the parameters through a fit on the available data, we give predictions for the observables which will be experimentally accessible with large statistics, polarized annihilation reactions.

Dates et versions

hal-00023143 , version 1 (20-04-2006)

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Egle Tomasi-Gustafsson, F. Lacroix, C. Duterte, G. I. Gakh. Nucleon electromagnetic form factors and polarization observables in space-like and time-like regions. European Physical Journal A, 2005, 24, pp.419-430. ⟨hal-00023143⟩
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