Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

Abstract

Pion and eta electroproduction data are jointly analyzed for the first time, up to a center-of-mass energy of 1.6 GeV. The framework is a dynamical coupled-channel model, based on the recent Jülich-Bonn-Washington analysis of pion electroproduction data for the same energy range. Comparisons are made to a number of single-channel eta electroproduction fits. By comparing multipoles of comparable fit quality, we find some of these amplitudes are well determined over the near-threshold region, while others will require fits over an extended energy range.

arXiv comment18 pages, 10 figures

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• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• The reaction $\pi N\to \omega N$ in a dynamical coupled-channel approach
• Global Data-Driven Determination of Baryon Transition Form Factors
• Coupled-channel contributions to the GDH sum rule from the Jülich-Bonn approach