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Electroproduction of p \pi^{+} \pi^{-} off protons at 0.2<Q^{2}<0.6 GeV^{2} and 1.3<W<1.57 GeV with CLAS

Abstract

This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process epepπ+πe p \to 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 << Q2Q^{2} << 0.6 GeV2^{2} and invariant mass of the final hadron system WW from 1.3 to 1.57 GeV. For the first time, nine independent 1-fold differential cross sections were determined in each bin of WW and Q2Q^{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)P11N(1440)P_{11} and N(1520)D13N(1520)D_{13} states in kinematical dependencies of the 1-fold differential cross-sections

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