dorsal/arxiv
View SchemaEffective Lagrangian Approach to pion photoproduction from the nucleon
| Authors | C. Fernandez-Ramirez, E. Moya de Guerra, J. M. Udias |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0509020 |
| URL | https://arxiv.org/abs/nucl-th/0509020 |
| DOI | 10.1016/j.aop.2006.02.009 |
| Journal | Annals Phys. 321 (2006) 1408-1456 |
Abstract
We present a pion photoproduction model on the free nucleon based on an Effective Lagrangian Approach (ELA) which includes the nucleon resonances ($\Delta(1232)$, N(1440), N(1520), N(1535), $\Delta (1620)$, N(1650), and $\Delta (1700)$), in addition to Born and vector meson exchange terms. The model incorporates a new theoretical treatment of spin-3/2 resonances, first introduced by Pascalutsa, avoiding pathologies present in previous models. Other main features of the model are chiral symmetry, gauge invariance, and crossing symmetry. We use the model combined with modern optimization techniques to assess the parameters of the nucleon resonances on the basis of world data on electromagnetic multipoles. We present results for electromagnetic multipoles, differential cross sections, asymmetries, and total cross sections for all one pion photoproduction processes on free nucleons. We find overall agreement with data from threshold up to 1 GeV in laboratory frame.
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"abstract": "We present a pion photoproduction model on the free nucleon based on an\nEffective Lagrangian Approach (ELA) which includes the nucleon resonances\n($\\Delta(1232)$, N(1440), N(1520), N(1535), $\\Delta (1620)$, N(1650), and\n$\\Delta (1700)$), in addition to Born and vector meson exchange terms. The\nmodel incorporates a new theoretical treatment of spin-3/2 resonances, first\nintroduced by Pascalutsa, avoiding pathologies present in previous models.\nOther main features of the model are chiral symmetry, gauge invariance, and\ncrossing symmetry. We use the model combined with modern optimization\ntechniques to assess the parameters of the nucleon resonances on the basis of\nworld data on electromagnetic multipoles. We present results for\nelectromagnetic multipoles, differential cross sections, asymmetries, and total\ncross sections for all one pion photoproduction processes on free nucleons. We\nfind overall agreement with data from threshold up to 1 GeV in laboratory\nframe.",
"arxiv_id": "nucl-th/0509020",
"authors": [
"C. Fernandez-Ramirez",
"E. Moya de Guerra",
"J. M. Udias"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/j.aop.2006.02.009",
"journal_ref": "Annals Phys. 321 (2006) 1408-1456",
"title": "Effective Lagrangian Approach to pion photoproduction from the nucleon",
"url": "https://arxiv.org/abs/nucl-th/0509020"
},
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