Physical Review C
This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep → e'pπ+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 < Q2 < 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.
Original Publication Citation
Amaryan, M. J., Bültmann, S., Dodge, G.E., Hyde, C.E., Kuhn, S.E., et al., CLAS Collaboration (2009). Electroproduction of p π⁺π⁻ off protons at 0.2 < Q² < 0.6 GeV² and 1.3 < W < 1.57 GeV with the CLAS detector. Physical Review C, 79(1), 1-23, Article 015204. https://doi.org/10.1103/PhysRevC.79.015204
0000-0003-1582-2376 (Dodge), 0000-0001-7282-8120 (Hyde), 0000-0003-2243-6836 (Kuhn)
Amaryan, M. J.; Baghdasaryan, H.; Bektasoglu, M.; Bültmann, S.; Careccia, S. L.; Dodge, G. E.; Gavalian, G.; Guler, N.; Hyde, C. E.; Kim, W.; Klein, A.; Klein, F. J.; Klimenko, A.; Kuhn, S. E.; Tkachenko, S.; Weinstein, L. B.; et al.; and CLAS Collaboration, "Electroproduction of p π⁺π⁻ off protons at 0.2 < Q² < 0.6 GeV² and 1.3 < W < 1.57 GeV with the CLAS detector" (2009). Physics Faculty Publications. 482.