The pole structure of low energy πN scattering amplitudes
This report presents an investigation of the pion-nucleon elastic scattering in low energy region using a production representation of the partial wave S matrix. The phase shifts are separated into contributions from poles and branch cuts, where the left-hand cut term can be evaluated by tree-level...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2019-01-01
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| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_02004.pdf |
| _version_ | 1819299261452386304 |
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| author | Wang Yu-Fei |
| author_facet | Wang Yu-Fei |
| author_sort | Wang Yu-Fei |
| collection | DOAJ |
| description | This report presents an investigation of the pion-nucleon elastic scattering in low energy region using a production representation of the partial wave S matrix. The phase shifts are separated into contributions from poles and branch cuts, where the left-hand cut term can be evaluated by tree-level covariant baryon chiral perturbation theory. A comparison between the sum of known contributions and the data in S- and P- wave channels is made. It is found that the known components in S11 and P11 channels are far from enough to saturate the corresponding experimental data, indicating the existence of low-lying hidden poles. The positions of those hidden poles are figured out and the physics behind them are explored. |
| first_indexed | 2024-12-24T05:42:59Z |
| format | Article |
| id | doaj.art-b1da769af54942ac9379f2ed18c7ce6e |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-24T05:42:59Z |
| publishDate | 2019-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-b1da769af54942ac9379f2ed18c7ce6e2022-12-21T17:12:45ZengEDP SciencesEPJ Web of Conferences2100-014X2019-01-011990200410.1051/epjconf/201919902004epjconf_meson2019_02004The pole structure of low energy πN scattering amplitudesWang Yu-Fei0Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking UniversityThis report presents an investigation of the pion-nucleon elastic scattering in low energy region using a production representation of the partial wave S matrix. The phase shifts are separated into contributions from poles and branch cuts, where the left-hand cut term can be evaluated by tree-level covariant baryon chiral perturbation theory. A comparison between the sum of known contributions and the data in S- and P- wave channels is made. It is found that the known components in S11 and P11 channels are far from enough to saturate the corresponding experimental data, indicating the existence of low-lying hidden poles. The positions of those hidden poles are figured out and the physics behind them are explored.https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_02004.pdf |
| spellingShingle | Wang Yu-Fei The pole structure of low energy πN scattering amplitudes EPJ Web of Conferences |
| title | The pole structure of low energy πN scattering amplitudes |
| title_full | The pole structure of low energy πN scattering amplitudes |
| title_fullStr | The pole structure of low energy πN scattering amplitudes |
| title_full_unstemmed | The pole structure of low energy πN scattering amplitudes |
| title_short | The pole structure of low energy πN scattering amplitudes |
| title_sort | pole structure of low energy πn scattering amplitudes |
| url | https://www.epj-conferences.org/articles/epjconf/pdf/2019/04/epjconf_meson2019_02004.pdf |
| work_keys_str_mv | AT wangyufei thepolestructureoflowenergypnscatteringamplitudes AT wangyufei polestructureoflowenergypnscatteringamplitudes |