Electroproduction of \u3ci\u3epπ\u3c/i\u3e+\u3ci\u3e​π\u3c/i\u3e- Off Protons at 0.2 \u3c \u3ci\u3eQ\u3c/i\u3e\u3csup\u3e2\u3c/sup\u3e \u3c 0.6 GeV\u3csup\u3e2\u3c/sup\u3e and 1.3 \u3c \u3ci\u3eW\u3c/i\u3e \u3c 1.57 GeV with the CLAS Detector

This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep → e\u27pπ+π −. The data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the as yet unexplored kinematic region of photon virtuality 0.2 \u3c Q2 \u3c 0.6 GeV2 and invariant mass of the final hadron system W from 1.3 to 1.57 GeV. For the first time, nine independent one-fold differential cross sections were determined in each bin of W and Q2 covered by the measurements. A phenomenological analysis of the data allowed us to establish the most significant mechanisms contributing to the reaction. The nonresonant 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)P11 and N(1520)D13 states in kinematic dependencies of the one-fold differential cross sections