Model analysis of theep→e'pπ+π−electroproduction reaction on the proton

Abstract

Recent CLAS data on the $p{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ electroproduction off protons at $1.3lWl1.57$ GeV and $0.25l{Q}^{2}l0.6 {\mathrm{GeV}}^{2}$ have been analyzed using a meson-baryon phenomenological model. By fitting nine onefold differential cross-section data for each $W$ and ${Q}^{2}$ bin, the charged double-pion electroproduction mechanisms are identified from their manifestations in the observables. We have extracted the cross sections from amplitudes of each of the considered isobar channels as well as from their coherent sum. We also obtained nonresonant partial wave amplitudes of all contributing isobar channels that could be useful for advancing a complete coupled-channels analysis of all meson electroproduction data.