Electroproduction of pπ+π− off protons at 0.2

This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process $$e p \rightarrow e' p \pi^{+} \pi^{-} $$. The data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the so-far unexplored kinematic region of photon virtuality 0.2 $<$ $$Q^{2}$$ $<$ 0.6 GeV$$^{2}$$ and invariant mass of the final hadron system $W$ from 1.3 to 1.57~GeV. For the first time, nine independent 1-fold differential cross sections were determined in each bin of $W$ and $$Q^{2}$$ covered by the measurements. A phenomenological analysis of the data allowed us to establish the most significant mechanisms contributing to the reaction. The non-resonant mechanisms account for a major part of cross-sections. However, we find sensitivity to s-channel excitations of low-mass nucleon resonances, especially to the $$N(1440)P_{11}$$ and $$N(1520)D_{13}$$ states in kinematical dependencies of the 1-fold