Electroproduction of p{pi}{sup +}{pi}{sup -} off protons at 0.2<Q{sup 2}<0.6 GeV{sup 2} and 1.3<W<1.57 GeV with the CLAS detector
- Moscow State University, Skobeltsyn Nuclear Physics Institute and Physics Department, RU-119899 Moscow (Russian Federation)
- Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
This paper reports on the most comprehensive data set obtained on differential and fully integrated cross sections for the process ep{yields}e{sup '}p{pi}{sup +}{pi}{sup -}. 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<Q{sup 2}<0.6 GeV{sup 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 Q{sup 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)P{sub 11} and N(1520)D{sub 13} states in kinematic dependencies of the one-fold differential cross sections.
- OSTI ID:
- 21199519
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 79, Issue 1; Other Information: DOI: 10.1103/PhysRevC.79.015204; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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