Jülich-Bonn-Washington Model for Pion Electroproduction Multipoles

Abstract

Pion electroproduction off the proton is analyzed in a new framework based on a general parametrization of transition amplitudes, including constraints from gauge invariance and threshold behavior. Data with energies $1.13\mathrm{GeV}<W<1.6\mathrm{GeV}$ and $Q^2$ below $6{\mathrm{GeV}}^2$ are included. The model is an extension of the latest Jülich-Bonn solution incorporating constraints from pion-induced and photoproduction data. Performing large scale fits ($\sim 10^5$ data) we find a set of solutions with ${\chi }_{\mathrm{dof}}^2=1.69-1.81$ which allows us to assess the systematic uncertainty of the approach.

arXiv comment27 pages, 14 figures

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• Light Baryon Spectroscopy
• Light baryon resonances from a coupled-channel study including $\mathbf{K\Sigma }$ photoproduction
• Pole position of the $a_1(1260)$ resonance in a three-body unitary framework
• Electromagnetic Transition Form Factors of Baryon Resonances
• Photo- and Electrocouplings of Nucleon Resonances
• Three-body dynamics of the $a_1(1260)$ resonance from lattice QCD
• Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model
• Resonances in heavy meson - heavy baryon coupled-channel interactions
• 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
• Beam-Recoil Transferred Polarization in $K^{+}Y$ Electroproduction in the Nucleon Resonance Region with CLAS12
• Global Data-Driven Determination of Baryon Transition Form Factors
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction
• Coupled-channel contributions to the GDH sum rule from the Jülich-Bonn approach