Electroproduction of pπ+π- [p pi superscript + pi superscript -] off protons at 0.2<Q2<0.6 GeV2 [0.2 < Q superscript 2 < 0.6 GeV superscript 2] and 1.3<W<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'pπ+π- [ep→e prime p pi superscript + pi superscript -]. The data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out i...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/65188 |
| Summary: | This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep→e'pπ+π- [ep→e prime p pi superscript + pi superscript -]. 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 [0.2 < Q superscript 2 < 0.6 GeV superscript 2] 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 [Q superscript 2] 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 [N (1440) P subscript 11] and N(1520)D13 [N (1520) D subscript 13] states in kinematic dependencies of the one-fold differential cross sections. |
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